- The two sentences below can be combined. Choose the best combined sentence.
Diego did not sleep well the night before his presentation. He performed confidently in front of the audience.
Answer: Although Diego did not sleep well the night before his presentation, he performed confidently in front of the audience.
When combining two sentences, your first job is to identify the logical relationship between the ideas. Ask yourself: do the two ideas agree with each other, or does one contrast with or explain the other? Here, Diego didn't sleep well — yet he still performed confidently. That unexpected contrast is your key clue.
The word although signals a concession — it introduces a surprising or unexpected situation. Choice C ("Although Diego did not sleep well the night before his presentation, he performed confidently in front of the audience") captures that contrast perfectly. The reader understands that despite poor sleep, Diego still succeeded. That "despite" relationship is exactly what the original two sentences imply.
Choice A creates a comma splice — two independent clauses joined only by a comma, with no conjunction or subordinator. This is a grammatical error. Choice B uses so, which signals a cause-and-effect relationship, suggesting that not sleeping well caused the confident performance. That's logically backwards and changes the meaning entirely. Choice D uses because, which also implies causation — as if poor sleep led to confident performance — which is both illogical and contradicts the intended meaning.
A useful strategy: before looking at the answer choices, pause and mentally fill in the relationship word yourself. Would you say "because," "so," or "even though"? In this case, "even though" (synonymous with although) fits naturally. Whenever you see two contrasting ideas being combined, look for concession words like although, even though, or despite — these are your signals that C-type answers are worth a close look.
- Choose the answer that is a complete, correct sentence.
Answer: Lena wanted to improve her writing skills, so she joined a weekly workshop at the community center.
When joining two related ideas in English, you need to use the right connecting word and make sure both parts of the sentence have a subject and a verb. This question tests your ability to recognize complete, grammatically correct sentences and avoid common errors like comma splices, dangling modifiers, and fragments.
Option D is the correct answer. It connects two independent clauses — "Lena wanted to improve her writing skills" and "she joined a weekly workshop at the community center" — using the coordinating conjunction so, which correctly shows cause and effect. Both clauses have a subject and a verb, and the grammar is clean throughout.
Option A looks similar but contains a critical error called a comma splice. The word therefore is a conjunctive adverb, not a coordinating conjunction. You cannot use it to join two independent clauses with just a comma — you would need a semicolon before it: skills; therefore, she joined...
Option B creates confusion with the phrase "Lena wanting," which uses a participle instead of a proper verb. This leaves the first clause without a true main verb, making it a grammatically incomplete construction. The sentence feels awkward and is not standard written English.
Option C is a sentence fragment. It starts with Because, making the first clause dependent, and then "joining a weekly workshop" is another incomplete phrase. There is no independent clause to complete the thought — the sentence never arrives anywhere.
A useful tip: when you see two ideas joined by a comma, ask yourself what connecting word is being used. Only coordinating conjunctions (for, and, nor, but, or, yet, so) can join two independent clauses with just a comma.
- Choose the answer that is a complete, correct sentence.
Answer: Running through the park every morning before work, Kenji stayed healthy and focused throughout the day.
When you see a question asking you to identify a "complete, correct sentence," you're being tested on sentence structure — specifically, whether a sentence has a clear subject and a working main verb.
A complete sentence needs three things: a subject (who or what), a main verb (what they do or are), and a complete thought. The tricky part here is that all four options begin with a participial phrase — "Running through the park every morning before work" — which describes an action but cannot serve as the main verb on its own.
B is the correct answer because after the opening participial phrase, it delivers exactly what's needed: a subject ("Kenji") and a clear main verb ("stayed"). The participial phrase correctly modifies Kenji, and the sentence expresses a complete thought.
A fails because the word "which" turns the second half into a relative clause — a clause that modifies something rather than making a statement. There is no independent main clause, so the sentence never actually says anything on its own. This is a classic sentence fragment.
C simply strings two participial phrases together ("Running... and helping...") with no subject and no main verb at all. It's a fragment because nothing is actually doing or being anything.
D uses "so that," which introduces a purpose clause — a dependent clause that cannot stand alone. The result is another fragment: the opening phrase plus a dependent clause, but no independent clause to anchor the sentence.
Your strategy: always locate the subject and main verb first. If either is missing or buried in a dependent clause, the sentence is a fragment, no matter how long it looks.
- Choose the answer that is a complete, correct sentence.
Answer: Amara studied all night for her chemistry exam; she still felt nervous the next morning.
When two complete thoughts are joined in a single sentence, you need to pay close attention to punctuation — this question is testing your ability to recognize and fix a comma splice and related joining errors.
Two independent clauses (groups of words that can each stand alone as a sentence) must be connected properly. One reliable method is using a semicolon (;), which signals that the two ideas are closely related but keeps them grammatically separate. That's exactly what B does: "Amara studied all night for her chemistry exam; she still felt nervous the next morning." Both clauses are complete, the semicolon joins them correctly, and the meaning is clear. B is your answer.
A creates a classic comma splice — it uses only a comma to join two independent clauses, which isn't strong enough punctuation on its own. A comma alone cannot connect two complete sentences.
C adds the subordinating conjunction "because," but this creates a logical problem. "Because" signals a cause-and-effect relationship, implying that studying caused her nervousness — the opposite of what the sentence means. The word "still" in the original implies contrast, not cause.
D uses "however," which is a transitional adverb, not a coordinating conjunction. When you use "however" between two independent clauses, it must be preceded by a semicolon, not just a comma — making this another comma splice variant.
A handy tip: when you spot two complete sentences joined by only a comma, that's automatically wrong. Ask yourself whether the connecting word is a true conjunction (like and, but, so) or just a transition — transitions always need a semicolon before them.
- Choose the answer that is a complete, correct sentence.
Answer: The conference lasted three days and covered important topics in environmental science and urban planning.
When a question asks you to identify a "complete, correct sentence," you're being tested on two things: sentence completeness (does it have a subject and verb forming an independent clause?) and punctuation (are the clauses joined correctly?).
Answer D works because it contains one clean independent clause: "The conference" is the subject, and "lasted...and covered" are two verbs joined by the coordinating conjunction and. No extra punctuation is needed — it's grammatically complete and correct.
Answer A is a comma splice — two independent clauses ("The conference lasted three days" and "it covered topics...") joined only by a comma. A comma alone cannot connect two complete sentences. You'd need a semicolon, a period, or a conjunction like and.
Answer B is a run-on sentence — those same two independent clauses are fused together with no punctuation or conjunction at all. Running two complete thoughts together without any connector is always an error.
Answer C is a sentence fragment. The word which turns "which lasted three days and covered important topics" into a dependent (relative) clause. The sentence now reads like a noun phrase with a modifier — but there's no main verb completing the thought. It leaves the reader waiting: the conference which lasted three days... what about it?
A quick strategy: always locate the subject and main verb first, then check how clauses are connected. Watch especially for which, that, because, and although — these words create dependent clauses that cannot stand alone. If the whole sentence is built around one of them, it's likely a fragment.
- The two sentences below can be combined. Choose the best combined sentence.
Professor Osei explained the theory clearly. Many students still found it difficult to understand.
Answer: Professor Osei explained the theory clearly, yet many students still found it difficult to understand.
When combining two sentences, you need to choose a coordinating conjunction that accurately reflects the logical relationship between the ideas. Here, the two clauses express a contrast or surprise: even though the professor explained things clearly, students still struggled. That "despite what you'd expect" relationship is the key to solving this problem.
Choice B is correct because the conjunction "yet" signals contrast or unexpected opposition — exactly what's happening here. The clear explanation should have helped everyone understand, yet it didn't. "Yet" captures that logical tension perfectly while also correctly using a comma before the coordinating conjunction to join two independent clauses.
Choice A creates a comma splice — it joins two independent clauses with only a comma and no conjunction. This is a grammatical error regardless of how logical the meaning sounds.
Choice C uses "since," which signals a cause-and-effect or time relationship ("because" or "ever since"). That meaning doesn't work here — the professor didn't explain clearly because students found it difficult; those ideas contrast, they don't share a causal link.
Choice D uses "so," which signals that the first clause causes the second. That would mean the clear explanation caused the confusion — the opposite of what the sentence intends.
A useful strategy: before picking a conjunction, ask yourself what's the relationship between these ideas? Cause? Contrast? Addition? On this exam, contrast words like yet, but, however, and although are frequently tested because students often confuse them with causal words like so and since.
- The two sentences below can be combined. Choose the best combined sentence.
Fatima finished her report early. She had extra time to review her sources.
Answer: Because Fatima finished her report early, she had extra time to review her sources carefully.
When combining two sentences, your job is to find the conjunction or connector that accurately captures the logical relationship between the ideas. Here, the first sentence (finishing early) is the cause, and the second sentence (having extra time) is the effect. That cause-and-effect relationship is your key signal.
Choice C correctly uses the subordinating conjunction "because" to express that relationship. "Because Fatima finished her report early" establishes the cause, and "she had extra time to review her sources carefully" delivers the effect. The structure is grammatically complete, logically accurate, and flows naturally — making C the correct answer.
Now let's look at why the others fall short. Choice A creates a comma splice — two independent clauses joined by only a comma, which is a grammatical error. Choice B uses "so that," which implies Fatima's purpose or intention in finishing early (as if she planned it to gain review time), but the original sentences describe a result, not a plan — that's a subtle but important meaning shift. Choice D uses "however," which signals contrast or contradiction between ideas, but there's no contrast here — both sentences point in the same direction. Using "however" would imply something unexpected or opposite followed, which doesn't fit the meaning at all.
A useful strategy: before choosing a connector, ask yourself, "What is the relationship between these two ideas?" Is it cause/effect, contrast, purpose, or sequence? Matching the right connector to the right relationship will help you avoid traps like D, which inserts contrast where none exists.
- Choose the answer that is a complete, correct sentence.
Answer: The volunteers arrived early and set up the tables and chairs before the event began.
When a question asks you to identify a "complete, correct sentence," you're being tested on sentence structure — specifically whether a sentence has a subject, a complete verb, and expresses a complete thought without errors like run-ons or fragments.
A complete sentence needs three things: a subject (who or what), a finite verb (the action, properly conjugated), and a complete independent thought. Option D, "The volunteers arrived early and set up the tables and chairs before the event began," checks all three boxes. "The volunteers" is the subject, "arrived" and "set up" are two properly conjugated verbs joined by "and," and the sentence expresses a complete, standalone thought.
Now look at why the others fail. Option A is a run-on sentence — two independent clauses ("The volunteers arrived early" and "they set up the tables and chairs...") are smashed together without a conjunction or proper punctuation. You can't join two complete sentences that way. Option B is a fragment — "arriving" and "setting up" are participial forms, not finite verbs, so the sentence never states what the volunteers actually did; it just dangles without a complete predicate. Option C is also a fragment — adding "When" at the beginning turns the entire clause into a dependent clause, meaning it now waits for a main clause that never arrives.
A quick tip: if a sentence begins with a word like when, because, although, or since, read carefully — those words often signal a dependent clause that needs a main clause to complete the thought. Spotting that pattern alone will help you eliminate traps like C quickly.
- Choose the answer that is a complete, correct sentence.
Answer: The storm damaged several buildings in the neighborhood; it also caused widespread power outages.
When you see a question asking you to identify a "complete, correct sentence," you're being tested on two things: sentence completeness and punctuation rules for joining independent clauses.
A complete sentence needs a subject and a main verb, and it must express a complete thought. Option C does exactly this — "The storm damaged several buildings in the neighborhood" is one independent clause, and "it also caused widespread power outages" is another. The semicolon between them is the perfect tool for joining two related independent clauses without a conjunction. This makes C both grammatically complete and correctly punctuated.
Now let's look at why the others fail. Option A is a sentence fragment — it begins with the subordinating word "After," which turns the entire clause into a dependent clause waiting for a main idea that never arrives. There's no independent clause to anchor it. Option B is a comma splice, one of the most common errors on this exam. Two independent clauses are joined with only a comma, which isn't strong enough punctuation to do that job. You need either a semicolon, a period, or a comma with a coordinating conjunction (like "and" or "but"). Option D has no main verb at all — "damaging" and "causing" are participial forms, not true verbs. Without a proper verb, there's no predicate, and therefore no complete sentence.
Your takeaway: memorize the three legal ways to join two independent clauses — a period, a semicolon, or a comma plus a coordinating conjunction (FANBOYS). If a sentence uses only a comma between two complete thoughts, it's a comma splice and always wrong.
- The two sentences below can be combined. Choose the best combined sentence.
The library closes at nine o'clock on weekdays. Students often stay until the last minute to finish their work.
Answer: The library closes at nine o'clock on weekdays, but students often stay until the last minute to finish their work.
When combining two independent clauses (complete sentences), you need to use a coordinating conjunction with a comma, or a semicolon. The key question here is not just how to join the clauses, but which connecting word accurately expresses the relationship between the two ideas.
Look at the two sentences: the library has a closing time, and students tend to push right up against that limit. These ideas contrast — the library stops at a fixed hour, yet students still linger. The word "but" captures that contrast perfectly, making A the correct choice.
Here's why the other options fail. B joins the two independent clauses with only a comma and no conjunction — this is called a comma splice, one of the most common punctuation errors in English. You can never connect two full sentences with just a comma. C uses "however," which is a conjunctive adverb, not a coordinating conjunction. When you use "however" between two independent clauses, it must be preceded by a semicolon and followed by a comma: ...on weekdays; however, students often... Without that punctuation, C is both a run-on sentence and incorrectly punctuated. D uses "so," which implies that the library's closing time is the cause and students staying late is the result — that's a cause-and-effect relationship, which doesn't match the meaning here.
A helpful tip: memorize the seven coordinating conjunctions using the acronym FANBOYS (For, And, Nor, But, Or, Yet, So). When combining sentences, pair them with a comma — and always ask yourself whether the conjunction you've chosen matches the logical relationship between the ideas.
