Health Education Systems Inc (HESI) A2 Exam Quiz: Punctuation Errors
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Punctuation ErrorsQuestion 1 of 20

Choose the sentence that is grammatically correct.

The lab results were inconclusive, the physician ordered a second round of tests.
The lab results were inconclusive; the physician ordered a second round of tests.
The lab results were inconclusive: the physician ordered a second round of tests.
The lab results were inconclusive and, the physician ordered a second round of tests.
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Health Education Systems Inc (HESI) A2 Exam Quiz

Health Education Systems Inc (HESI) A2 Exam Quiz: Punctuation Errors

Practice Punctuation Errors in Health Education Systems Inc (HESI) A2 Exam with focused quiz questions that help you check what you know, review explanations, and build confidence with test-style prompts.

What this quiz covers

This quiz focuses on Punctuation Errors, giving you a quick way to practice the rules, question types, and explanations that matter most for Health Education Systems Inc (HESI) A2 Exam.

How to use this quiz

Try each quiz question before looking at the correct answer. Use the explanations to review missed ideas, then come back to similar questions until the pattern feels familiar.

All questions

Question 1

Choose the sentence that is grammatically correct.

  1. The lab results were inconclusive, the physician ordered a second round of tests.
  2. The lab results were inconclusive; the physician ordered a second round of tests. (correct answer)
  3. The lab results were inconclusive: the physician ordered a second round of tests.
  4. The lab results were inconclusive and, the physician ordered a second round of tests.
Explanation: When you encounter questions about joining two independent clauses (complete sentences that could stand alone), you need to identify the appropriate punctuation to connect them properly. The correct answer is B because it uses a semicolon to join two related independent clauses. A semicolon is the perfect punctuation mark when you have two complete thoughts that are closely related in meaning. Both "The lab results were inconclusive" and "the physician ordered a second round of tests" are independent clauses, and the semicolon elegantly connects them while showing their logical relationship. Choice A creates a comma splice, which is a serious grammatical error. You cannot join two independent clauses with just a comma—this creates a run-on sentence that confuses readers about where one thought ends and another begins. Choice C incorrectly uses a colon. Colons introduce explanations, lists, or examples that directly elaborate on what comes before them. Here, the second clause doesn't explain what "inconclusive" means—it describes a consequence, not a definition. Choice D attempts to use a coordinating conjunction ("and") but incorrectly places a comma immediately after it. When joining independent clauses with coordinating conjunctions (and, but, or, nor, for, so, yet), the comma goes before the conjunction, not after it. For HESI grammar questions, remember this hierarchy for joining independent clauses: semicolons work when the thoughts are closely related, coordinating conjunctions with proper comma placement show specific relationships, and periods create the strongest separation. Avoid comma splices at all costs.

Question 2

Select the sentence that is grammatically correct and properly structured.

  1. The physical therapist demonstrated the exercise and the patient copied the movement carefully.
  2. The physical therapist demonstrated the exercise, and the patient copied the movement carefully. (correct answer)
  3. The physical therapist demonstrated the exercise, the patient copied the movement carefully.
  4. The physical therapist demonstrated the exercise; and the patient copied the movement carefully.
Explanation: When you encounter grammar questions about joining two complete sentences, focus on the punctuation and conjunctions used to connect them. Two independent clauses (complete thoughts that could stand alone) require specific punctuation rules. Option B is correct because it properly joins two independent clauses with a comma followed by a coordinating conjunction ("and"). The first clause "The physical therapist demonstrated the exercise" and the second clause "the patient copied the movement carefully" are both complete thoughts. When connecting them with "and," you must place a comma before the conjunction. Option A is incorrect because it's missing the comma before "and." While this might seem minor, proper comma usage before coordinating conjunctions (and, but, or, nor, for, so, yet) is essential when joining independent clauses. Option C creates a comma splice error. You cannot join two independent clauses with only a comma—this creates a run-on sentence that violates standard grammar rules. Option D incorrectly uses a semicolon followed by "and." Semicolons can join independent clauses, but when you use a semicolon, you don't add a coordinating conjunction. It should be either a semicolon alone or a comma with "and," but never both together. Remember this pattern for the HESI: comma + coordinating conjunction = correct way to join independent clauses. If you can split a sentence into two complete thoughts, check that they're properly connected with appropriate punctuation.

Question 3

Which sentence correctly shows possession for a name ending in 's'?

  1. Dr. Jones' patients appreciate her thorough explanations.
  2. Dr. Jone's patients appreciate her thorough explanations.
  3. Dr. Jones's patients appreciate her thorough explanations. (correct answer)
  4. Dr. Joneses patients appreciate her thorough explanations.
Explanation: When you encounter questions about possessive forms, especially with names ending in 's', you're dealing with one of English grammar's most debated rules. The key is understanding that modern style guides have largely standardized the approach. The correct answer is C because contemporary grammar rules recommend adding an apostrophe plus 's' to form the possessive of singular nouns, even when they already end in 's'. "Dr. Jones's patients" follows this standard rule consistently. The name "Jones" is singular (referring to one person), so it takes the standard possessive form: apostrophe + s. Looking at the wrong answers: Option A follows an older style rule that some guides once preferred, adding only an apostrophe after names ending in 's'. While this wasn't technically incorrect in the past, modern standards favor the apostrophe + s approach. Option B creates "Dr. Jone's," which changes the actual name from "Jones" to "Jone" – you should never alter the spelling of a proper noun to form a possessive. Option D omits the apostrophe entirely, making "Joneses" a plural form rather than a possessive, which completely changes the meaning. For HESI success, remember this simple rule: treat singular nouns ending in 's' just like any other singular noun when forming possessives – add apostrophe + s. This applies to names like Jones, Williams, or Davis. The consistency of this approach makes it easier to remember than trying to recall exceptions for different types of words.

Question 4

Which sentence correctly punctuates the date and location?

  1. The policy enacted on March 15 2023, originated in Omaha, Nebraska before its adoption.
  2. The policy enacted on March 15, 2023 originated in Omaha Nebraska, before its adoption.
  3. The policy enacted on March 15, 2023, originated in Omaha, Nebraska, before its adoption. (correct answer)
  4. The policy enacted on March 15, 2023 originated in Omaha, Nebraska before its adoption.
Explanation: When you encounter punctuation questions involving dates and locations, focus on where commas are required to separate elements and set off non-essential information. The correct answer is C because it follows proper comma usage rules. In dates written as "month day, year," you need a comma between the day and year, plus another comma after the year when the sentence continues. So "March 15, 2023," requires commas in both positions. For locations with city and state, you need a comma between them, and another comma after the state when the sentence continues, making "Omaha, Nebraska," correct. Choice A lacks the essential comma between "15" and "2023" in the date, creating an incorrect date format. Choice B omits the comma after "2023," failing to properly close the date element, and also missing the comma between "Omaha" and "Nebraska." Choice D correctly punctuates the date but omits both commas around "Nebraska" – it needs a comma before "Nebraska" to separate city from state, and after "Nebraska" because the sentence continues. The key principle is that when you insert additional information (like a year in a date or a state after a city) into a sentence, you must use commas to set off that information completely. Think of it as opening and closing parentheses – if you open with a comma, you must close with one too when the sentence continues. Remember: dates and locations act as interrupting elements that require complete comma pairs when embedded in sentences.

Question 5

Which sentence correctly punctuates a healthcare directive that contains an embedded title, a temporal clause, and a list with internal punctuation?

  1. Before implementing the new "Patient Safety First" initiative, staff must complete training in: fall prevention, March 15; medication verification, April 2; and emergency protocols, April 20.
  2. Before implementing the new "Patient Safety First" initiative staff must complete training in fall prevention, March 15, medication verification, April 2, and emergency protocols, April 20.
  3. Before implementing the new "Patient Safety First" initiative, staff must complete training in fall prevention, March 15; medication verification, April 2; and emergency protocols, April 20. (correct answer)
  4. Before implementing the new "Patient Safety First," initiative, staff must complete training in fall prevention, March 15; medication verification, April 2; and emergency protocols, April 20.
Explanation: Choice C correctly uses a comma after the introductory temporal clause, properly punctuates the title without unnecessary internal commas, and uses semicolons to separate list items that contain internal punctuation (commas between activities and dates). Choice A unnecessarily introduces the list with a colon after a preposition. Choice B omits the comma after the introductory clause and fails to use semicolons for the complex list, creating confusion. Choice D incorrectly places a comma within the title "Patient Safety First."

Question 6

Which sentence correctly punctuates a medical instruction that contains both a parenthetical citation and an appositive phrase?

  1. According to the latest research (Johnson et al., 2023), the new protocol, a comprehensive approach to pain management, has shown remarkable results. (correct answer)
  2. According to the latest research, (Johnson et al., 2023) the new protocol—a comprehensive approach to pain management, has shown remarkable results.
  3. According to the latest research (Johnson et al., 2023) the new protocol—a comprehensive approach to pain management—has shown remarkable results.
  4. According to the latest research, (Johnson et al., 2023), the new protocol—a comprehensive approach to pain management, has shown remarkable results.
Explanation: Choice A correctly punctuates the parenthetical citation without additional commas and properly sets off the appositive phrase 'a comprehensive approach to pain management' with commas. Choice B incorrectly places a comma before the parenthetical citation and mixes em dashes with commas for the appositive. Choice C omits the necessary comma after the parenthetical citation and inconsistently punctuates the appositive. Choice D unnecessarily sets off the parenthetical citation with commas and inconsistently punctuates the appositive phrase.

Question 7

In a clinical report, which sentence demonstrates correct punctuation when introducing a formal quotation that spans multiple sentences?

  1. The attending physician concluded: "The patient's condition has stabilized. We can proceed with the planned treatment." (correct answer)
  2. The attending physician concluded, "The patient's condition has stabilized. We can proceed with the planned treatment."
  3. The attending physician concluded; "The patient's condition has stabilized. We can proceed with the planned treatment."
  4. The attending physician concluded that: "The patient's condition has stabilized. We can proceed with the planned treatment."
Explanation: Choice A correctly uses a colon to introduce the formal, multi-sentence quotation after a complete independent clause. Colons are preferred for introducing longer, more formal quotations. Choice B uses a comma, which is typically reserved for shorter quotations or when the quotation is integrated into the sentence structure. Choice C incorrectly uses a semicolon to introduce a quotation. Choice D incorrectly combines 'that' with a colon, creating redundant introduction methods.

Question 8

In documenting patient care, which sentence demonstrates proper punctuation when using quotation marks with other punctuation in a complex statement?

  1. The patient stated, "I feel much better today"; however, her vital signs indicated otherwise. (correct answer)
  2. The patient stated, "I feel much better today," however, her vital signs indicated otherwise.
  3. The patient stated, "I feel much better today", however, her vital signs indicated otherwise.
  4. The patient stated, "I feel much better today;" however, her vital signs indicated otherwise.
Explanation: Choice A correctly places the semicolon outside the quotation marks because it's part of the larger sentence structure, not part of the quoted material. The semicolon properly connects the two independent clauses joined by 'however.' Choice B creates a comma splice by using a comma before 'however' when connecting two independent clauses. Choice C incorrectly places the comma outside the quotation marks and creates a comma splice. Choice D incorrectly places the semicolon inside the quotation marks when it's not part of the original quoted statement.

Question 9

Which sentence is punctuated correctly?

  1. The triage nurse assessed the patients airway, breathing and circulation.
  2. The triage nurse assessed the patient's airway, breathing, and circulation. (correct answer)
  3. The triage nurse assessed the patient's airway, breathing and circulation.
  4. The triage nurse assessed the patient's: airway, breathing, and circulation.
Explanation: When you encounter punctuation questions on the HESI exam, focus on the fundamental rules of apostrophes, commas, and colons. These questions test your ability to apply standard English conventions that are essential for clear medical communication. The correct answer is B because it follows two key punctuation rules. First, it uses an apostrophe correctly to show possession - "patient's" indicates that the airway, breathing, and circulation belong to the patient. Second, it includes the Oxford comma (also called the serial comma) before "and" in the series "airway, breathing, and circulation." While the Oxford comma is sometimes optional in general writing, it's the preferred standard in medical and academic contexts because it eliminates potential ambiguity. Choice A is incorrect because it's missing the apostrophe in "patients," making it unclear whether we're discussing one patient or multiple patients. Choice C has the correct possessive apostrophe but omits the Oxford comma, which could create confusion in medical documentation. Choice D incorrectly uses a colon after "patient's." Colons should only follow independent clauses (complete sentences), but "The triage nurse assessed the patient's" is not a complete thought. For HESI grammar questions, remember that medical writing demands precision and clarity. Always use apostrophes to show possession when needed, include the Oxford comma in series for maximum clarity, and only use colons after complete sentences. These conventions help prevent dangerous misunderstandings in healthcare communication.

Question 10

Which sentence correctly punctuates the quoted material?

  1. "Please take this medication with a full glass of water", the pharmacist advised.
  2. "Please take this medication with a full glass of water." the pharmacist advised.
  3. "Please take this medication with a full glass of water,"; the pharmacist advised.
  4. "Please take this medication with a full glass of water," the pharmacist advised. (correct answer)
Explanation: When you encounter questions about punctuating dialogue, you need to understand how quotation marks interact with other punctuation marks, particularly when the quoted speech is part of a larger sentence structure. The correct answer is D because it follows the standard rule for punctuating quoted dialogue within a sentence. When a direct quotation is followed by an attribution phrase (like "the pharmacist advised"), you place a comma inside the closing quotation marks, then continue with the attribution in lowercase. This creates a smooth, grammatically correct sentence where the quotation and attribution work together as one complete thought. Let's examine why the other options fail: Option A places the comma outside the quotation marks, which violates American English punctuation rules—commas and periods always go inside quotation marks. Option B uses a period inside the quotation marks, which incorrectly treats the quote as a complete, standalone sentence when it's actually part of a larger sentence structure. Option C creates a punctuation disaster by combining a comma inside the quotes with a semicolon outside—this is simply incorrect and creates confusion about sentence structure. For HESI success, remember this key rule: when quoted material is followed by an attribution phrase in the same sentence, use a comma inside the quotation marks, not a period. The comma signals that the sentence continues, while a period would incorrectly end it. This pattern appears frequently on standardized tests, so mastering dialogue punctuation will serve you well across multiple question types.

Question 11

Select the sentence that avoids punctuation and structural errors.

  1. The patient was dehydrated, the doctor ordered intravenous fluids immediately.
  2. The patient was dehydrated the doctor ordered intravenous fluids immediately.
  3. Because the patient was dehydrated the doctor ordered intravenous fluids immediately.
  4. Because the patient was dehydrated, the doctor ordered intravenous fluids immediately. (correct answer)
Explanation: This question tests your understanding of sentence structure and punctuation, specifically focusing on comma splices and dependent clauses. When you encounter sentences with multiple clauses, you need to identify their relationship and punctuate accordingly. The correct answer is D because it properly handles a complex sentence with a dependent clause. "Because the patient was dehydrated" is a dependent clause that cannot stand alone as a complete sentence. When a dependent clause begins a sentence, it must be followed by a comma before the independent clause "the doctor ordered intravenous fluids immediately." Let's examine why the other options are incorrect: Option A creates a comma splice error. It incorrectly joins two independent clauses ("The patient was dehydrated" and "the doctor ordered intravenous fluids immediately") with only a comma. Independent clauses need stronger punctuation like a semicolon or a coordinating conjunction with a comma. Option B creates a run-on sentence by connecting two independent clauses without any punctuation at all. This makes the sentence confusing and grammatically incorrect. Option C fails to include the necessary comma after the introductory dependent clause "Because the patient was dehydrated." This creates a structural error that makes the sentence harder to read and understand. Study tip: Remember the rule for dependent clauses at the beginning of sentences: dependent clause + comma + independent clause. Also watch for comma splices—two complete thoughts joined only by a comma are always incorrect. When you see "because," "although," "when," or similar words starting a sentence, expect a comma before the main clause.

Question 12

Choose the correctly punctuated sentence.

  1. The diagnosis suggested a viral infection, however, tests pointed to a bacterial cause.
  2. The diagnosis suggested a viral infection; however, tests pointed to a bacterial cause. (correct answer)
  3. The diagnosis suggested a viral infection, however; tests pointed to a bacterial cause.
  4. The diagnosis suggested a viral infection; however tests pointed to a bacterial cause.
Explanation: When you encounter punctuation questions involving transitional words like "however," you need to understand how to properly connect two independent clauses that express contrasting ideas. The correct answer is B because it follows the proper punctuation rule for using "however" as a conjunctive adverb between two independent clauses. The semicolon before "however" correctly separates the two complete thoughts, while the comma after "however" properly sets off this transitional word. Both "The diagnosis suggested a viral infection" and "tests pointed to a bacterial cause" are complete sentences that can stand alone. Option A is incorrect because it creates a comma splice. You cannot join two independent clauses with just a comma, even when using a transitional word like "however." This is a common error that creates a run-on sentence. Option C places the semicolon in the wrong position. The semicolon should come before "however," not after it. This placement disrupts the flow and creates an awkward construction where "however" is separated from the clause it's meant to introduce. Option D omits the necessary comma after "however." When "however" functions as a conjunctive adverb at the beginning of a clause, it must be followed by a comma to properly set it off from the rest of the sentence. Remember this pattern for the HESI: semicolon + however + comma. This structure properly connects contrasting independent clauses and is frequently tested in grammar sections. Practice identifying independent clauses to master these punctuation rules.

Question 13

Choose the sentence that correctly uses punctuation to introduce a list.

  1. The patient's chart noted several allergies: penicillin, sulfa drugs, and latex. (correct answer)
  2. The patient's chart noted several allergies were; penicillin, sulfa drugs, and latex.
  3. The patient's chart noted several allergies, such as: penicillin, sulfa drugs, and latex.
  4. The patient's chart noted several allergies including, penicillin, sulfa drugs, and latex.
Explanation: When you encounter questions about punctuation and lists, focus on how colons and other punctuation marks properly connect introductory clauses to the items that follow. The correct answer is A because it uses a colon appropriately after a complete independent clause. "The patient's chart noted several allergies" is a complete sentence that can stand alone, and the colon effectively introduces the specific list of allergies that follows. This is the standard rule: use a colon after a complete statement when introducing a list, explanation, or elaboration. Option B incorrectly uses a semicolon instead of a colon. Semicolons connect two independent clauses or separate complex list items—they don't introduce simple lists. The phrase "several allergies were" also creates an incomplete, awkward construction. Option C places a colon after "such as," which is incorrect. The phrase "such as" already signals that examples will follow, so adding a colon creates redundant punctuation. When you use "such as," no additional punctuation is needed before the list. Option D misuses a comma after "including." Like "such as," the word "including" inherently introduces examples, so no punctuation should separate it from the list that follows. The comma interrupts the natural flow from the introductory word to its examples. Remember this pattern: use a colon only after a complete independent clause when introducing a list. If you're using transitional phrases like "such as" or "including," don't add extra punctuation—these phrases already do the introductory work.

Question 14

Choose the sentence that is punctuated correctly.

  1. The new medication, which has fewer side effects was approved by the FDA.
  2. The new medication which has fewer side effects, was approved by the FDA.
  3. The new medication, which has fewer side effects, was approved by the FDA. (correct answer)
  4. The new medication which has fewer side effects was approved by the FDA.
Explanation: When you encounter punctuation questions involving relative clauses, you need to determine whether the clause is restrictive (essential to meaning) or non-restrictive (provides additional information). This distinction controls comma usage. The phrase "which has fewer side effects" is a non-restrictive relative clause because it adds extra information about the medication without changing the core meaning of the sentence. Non-restrictive clauses beginning with "which" must be set off with commas on both sides when they appear in the middle of a sentence. Option C correctly places commas before and after the entire relative clause: "The new medication, which has fewer side effects, was approved by the FDA." This properly isolates the additional information while maintaining the sentence's flow. Option A places a comma only before "which" but omits the closing comma after "effects," creating an incomplete separation of the non-restrictive clause. Option B incorrectly places the comma after "effects" but omits the opening comma before "which," again failing to properly set off the clause. Option D uses no commas at all, treating the clause as restrictive when it should be non-restrictive. Remember this pattern: "which" clauses that provide extra information (non-restrictive) need commas on both sides, while "that" clauses typically don't use commas because they're restrictive. On the HESI, watch for questions that test your ability to identify when information is essential versus supplementary—this skill appears in both grammar and reading comprehension sections.

Question 15

Choose the sentence that correctly uses "its" and "it's".

  1. The medical device is nearing the end of it's useful life; its time for a replacement.
  2. The medical device is nearing the end of its useful life; it's time for a replacement. (correct answer)
  3. The medical device is nearing the end of its useful life; its time for a replacement.
  4. The medical device is nearing the end of it's useful life; it's time for a replacement.
Explanation: When you encounter questions about "its" versus "it's," you're being tested on one of the most common possessive versus contraction distinctions in English. The key is remembering that "its" (without an apostrophe) shows possession, while "it's" (with an apostrophe) is a contraction meaning "it is" or "it has." Let's examine this sentence about a medical device. The first part needs to show that the useful life belongs to the device, so you need the possessive form "its" (no apostrophe). The second part means "it is time for a replacement," so you need the contraction "it's" (with apostrophe). This makes choice B correct: "its useful life" and "it's time." Choice A incorrectly uses "it's" for possession in the first clause and "its" instead of the contraction in the second clause - exactly backwards. Choice C uses the correct possessive "its" in the first part but fails to use the contraction "it's" in the second part, writing "its time" instead of "it's time." Choice D makes the same possession error as choice A, using "it's" where "its" is needed. Here's a reliable test: try substituting "it is" wherever you see "it's." If the sentence still makes sense, the apostrophe belongs. If not, use "its" without the apostrophe. For HESI grammar questions, this substitution method will quickly help you distinguish between these commonly confused forms.

Question 16

Choose the sentence that uses a colon correctly for emphasis or explanation.

  1. The patient's condition had one clear cause; a severe allergic reaction to the antibiotic.
  2. The patient's condition had one clear cause, a severe allergic reaction to the antibiotic.
  3. The patient's condition had one clear cause: a severe allergic reaction to the antibiotic. (correct answer)
  4. The patient's condition had one clear cause, which was: a severe allergic reaction to the antibiotic.
Explanation: When you encounter punctuation questions on the HESI, focus on understanding how different punctuation marks function to connect ideas. Colons have a specific purpose: they introduce explanations, lists, or elaborations that directly relate to what comes before them. The correct answer is C because it properly uses a colon to introduce an explanation. The phrase "one clear cause" creates an expectation that you're about to learn what that cause is, and the colon signals that the following information will fulfill that expectation. The structure "statement: explanation" is grammatically correct and creates the emphasis the question asks for. Option A incorrectly uses a semicolon, which should connect two independent clauses of equal importance. Since "a severe allergic reaction to the antibiotic" isn't a complete sentence, a semicolon doesn't work here. Option B uses a comma, which creates a grammatically acceptable sentence but doesn't provide the emphasis or clear signal that an explanation follows—it reads more like a casual aside. Option D places the colon incorrectly after "was," breaking up the flow of the sentence awkwardly. The colon should come after the complete thought that's being explained, not in the middle of a phrase. For HESI punctuation questions, remember that colons act like arrows pointing to explanations or examples. Use them when you want to say "here's what I mean" or "here's the specific information." If the part after the colon explains or specifies what came before, you're likely on the right track.

Question 17

Select the sentence that correctly punctuates the interrupted quotation.

  1. "I believe," the chief surgeon stated, "That this new procedure will reduce recovery time."
  2. "I believe" the chief surgeon stated, "that this new procedure will reduce recovery time."
  3. "I believe," the chief surgeon stated. "that this new procedure will reduce recovery time."
  4. "I believe," the chief surgeon stated, "that this new procedure will reduce recovery time." (correct answer)
Explanation: When you encounter interrupted quotations on the HESI exam, you need to understand how punctuation works when a speaker's words are split by an attribution phrase like "he said" or "she stated." The correct answer is D because it follows the proper rules for interrupted quotations. When a quotation is interrupted by an attribution, you place a comma after the first part of the quote, then a comma after the attribution phrase, and continue the second part of the quote with a lowercase letter (since it's continuing the same sentence). The word "that" should be lowercase because it's not starting a new sentence—it's continuing the surgeon's original statement. Option A incorrectly capitalizes "That" in the second part of the quotation. When continuing an interrupted quote that represents one complete thought, the word following the attribution should be lowercase unless it's a proper noun. Option B omits the crucial comma after the first part of the quotation ("I believe"). This comma is necessary to properly separate the quoted material from the attribution phrase. Option C uses a period after "stated" instead of a comma, which incorrectly treats this as two separate sentences rather than one interrupted quotation. This changes the meaning and structure of the original statement. Remember this pattern for interrupted quotations: "First part," attribution phrase, "second part continues." The key is recognizing whether you're dealing with one continuous thought (use commas) or two separate sentences (use a period after the attribution). Practice identifying the difference to master this common punctuation challenge.

Question 18

Which of the following sentences is punctuated correctly?

  1. The EKG machine, an essential diagnostic tool, requires regular calibration and maintenance. (correct answer)
  2. The EKG machine an essential diagnostic tool requires regular calibration and maintenance.
  3. The EKG machine (an essential diagnostic tool) requires regular calibration, and maintenance.
  4. The EKG machine—an essential diagnostic tool requires regular calibration and maintenance.
Explanation: When you encounter punctuation questions on the HESI, focus on how additional information is set off from the main sentence. The key is identifying whether extra details are properly enclosed with matching punctuation marks. The correct answer is A because it properly uses commas to set off the appositive phrase "an essential diagnostic tool." An appositive renames or describes the noun it follows (in this case, "EKG machine"). When an appositive provides non-essential information that could be removed without changing the sentence's core meaning, it must be enclosed by matching punctuation marks. The paired commas in option A correctly signal where the extra information begins and ends. Option B fails because it provides no punctuation to separate the appositive from the main sentence, creating a confusing run-on structure. Without commas, readers can't distinguish between the essential and non-essential information. Option C incorrectly mixes punctuation styles by using parentheses for the appositive but then adding an unnecessary comma before "and maintenance." The phrase "calibration and maintenance" is a simple compound object that doesn't require a comma before the conjunction. Option D uses only one em dash, leaving the appositive phrase unclosed. Em dashes, like commas and parentheses, must come in pairs when enclosing non-essential information within a sentence. Remember this pattern: appositives need matching punctuation pairs (commas, parentheses, or em dashes). If you see unmatched punctuation around descriptive phrases, that's usually your clue that the sentence contains an error.

Question 19

Choose the sentence that correctly demonstrates joint possession.

  1. Dr. Smith's and Dr. Chen's research was published in a leading medical journal.
  2. Dr. Smith and Dr. Chen's research was published in a leading medical journal. (correct answer)
  3. Dr. Smith's and Dr. Chen research was published in a leading medical journal.
  4. Dr. Smith and Dr. Chens' research was published in a leading medical journal.
Explanation: When you encounter questions about possession in writing, you need to distinguish between joint possession (where two people own something together) and separate possession (where each person owns their own item). The key is understanding how apostrophes work in these different scenarios. For joint possession, when two or more people share ownership of the same item, you only add the possessive apostrophe and "s" to the final person's name. In this case, Dr. Smith and Dr. Chen collaborated on one research project together, so it's "Dr. Smith and Dr. Chen's research." This shows they jointly own the research. Let's examine why the other options are incorrect: Option A uses "Dr. Smith's and Dr. Chen's research," which indicates separate possession - suggesting each doctor has their own individual research project. This would be correct if they each conducted different studies, but the sentence implies one shared project. Option C presents "Dr. Smith's and Dr. Chen research," which is grammatically inconsistent. You can't mix possessive and non-possessive forms when referring to joint owners. Option D shows "Dr. Smith and Dr. Chens'" with the apostrophe after the "s." This is incorrect because "Chen" is a proper noun, not a plural, so it should be "Chen's" not "Chens'." Remember this pattern: for joint possession, use "Name and Name's." For separate possession, use "Name's and Name's." Medical writing frequently involves collaborative research, so mastering joint possession rules will help you write clearly about team-based work and shared responsibilities in healthcare settings.

Question 20

Which sentence correctly uses semicolons in a complex list?

  1. The study participants came from Miami, Florida, Atlanta, Georgia, and Charlotte, North Carolina.
  2. The study participants came from several cities: Miami, Florida; Atlanta, Georgia; and Charlotte, North Carolina. (correct answer)
  3. The study participants came from several cities; Miami, Florida, Atlanta, Georgia, and Charlotte, North Carolina.
  4. The study participants came from several cities: Miami; Florida, Atlanta; Georgia, and Charlotte; North Carolina.
Explanation: Complex lists that contain internal punctuation require special formatting rules to maintain clarity. When list items already contain commas, you need semicolons to separate the major items and prevent confusion. Answer B correctly applies this rule by using a colon to introduce the list, then semicolons to separate each city-state pair: "Miami, Florida; Atlanta, Georgia; and Charlotte, North Carolina." The semicolons clearly divide the three locations while preserving the commas within each city-state combination. Answer A uses only commas throughout, creating ambiguity. A reader might interpret this as six separate items (Miami, Florida, Atlanta, Georgia, Charlotte, North Carolina) rather than three city-state pairs. This comma-only approach works for simple lists but fails when list items contain internal punctuation. Answer C incorrectly uses a semicolon after the introductory phrase, then reverts to comma-only formatting for the actual list items. This creates the same confusion as Answer A while misusing the semicolon in the introduction. Answer D misplaces semicolons within the city-state pairs themselves ("Miami; Florida"), which destroys the logical relationship between cities and their states. This makes the list incomprehensible and violates standard punctuation conventions. Remember this pattern for complex lists: colon to introduce, semicolons to separate major items that contain commas. This structure appears frequently in healthcare writing when listing medical facilities, patient demographics, or research locations. When you see a list with internal commas, immediately think "semicolons for clarity."