- Where should the comma go? Sofia finished her book and she wrote a short review.
Answer: Sofia finished her book, and she wrote a short review.
This question tests CCSS.L.4.2.c: using a comma before a coordinating conjunction in a compound sentence. Students must recognize compound sentences (two independent clauses joined by and/but/or/so) and place commas correctly. A compound sentence has two independent clauses (complete sentences) joined by a coordinating conjunction. The rule is: use a comma BEFORE the coordinating conjunction when joining two independent clauses. Pattern: [Independent clause] , [conjunction] [independent clause]. In this sentence, there are two independent clauses. The first independent clause is 'Sofia finished her book' and the second independent clause is 'she wrote a short review' joined by 'and'. Since both parts can stand alone as complete sentences, this is a compound sentence that needs a comma before the conjunction. Choice B is correct because it places the comma before the coordinating conjunction 'and' in the compound sentence. The pattern is: Independent clause (Sofia finished her book) , and Independent clause (she wrote a short review). Both parts can stand alone as sentences, so comma is needed. Choice A represents comma in wrong position, which occurs when students put comma after conjunction instead of before. The comma must come BEFORE the conjunction, not after. To help students: Teach the 'independence test' - cover up one side of the conjunction. If the words before the conjunction can stand alone as a complete sentence AND the words after can stand alone as a complete sentence, it's compound and needs a comma before the conjunction. Watch for: putting comma after conjunction instead of before (Choice A), placing commas randomly within clauses (Choices C and D), or forgetting that the comma goes directly before the conjunction.
- Maya wanted to play tag but it started to rain at recess. Which shows this compound sentence written with the correct punctuation for but?
Answer: Maya wanted to play tag, but it started to rain at recess.
In a compound sentence, a comma belongs right before the joining word but. The correct choice puts the comma before but, joining the two complete ideas the right way. One choice leaves out the comma completely, so the two ideas run together with no pause. Another choice puts the comma after but instead of before it, which is the wrong spot. The last choice does place a comma before but, but it also adds an extra comma before at recess, where no comma is needed. Only the choice with a single comma before but is punctuated correctly.
- Which sentence uses commas correctly?
Answer: Emma forgot her notebook, so she borrowed paper from a friend.
The correct sentence puts a comma before the joining word "so" because it connects two complete sentences: "Emma forgot her notebook" and "she borrowed paper from a friend." One sentence leaves out the comma completely, so nothing signals where the two parts join. Another adds a comma after "and" and a second comma before "from a friend"; both commas break up one single idea instead of joining two complete sentences, so they are placed wrongly. The last sentence uses a comma but drops the joining word, which glues two complete sentences together and creates a run-on. Only the sentence with a comma right before "so" joins the two complete parts the correct way.
- Which sentence uses a comma correctly to join two complete sentences?
Answer: You can borrow my markers, or you can use your crayons today.
When you join two complete sentences with a joining word like 'or,' put the comma right before that word. The best answer places the comma before 'or,' so the two full sentences are connected smoothly. One choice puts the comma after 'or' instead of before it, which is the wrong spot. Another choice leaves the comma out completely, so the two sentences run together with no pause. The last choice keeps a comma but drops the joining word 'or,' which creates a comma splice—two full sentences stuck together with only a comma. Only the correct answer has both the comma AND the joining word in the right places.
- Which sentence uses the comma correctly before so in a compound sentence?
Answer: Emma forgot her notebook, so she borrowed a spare from a friend.
A compound sentence joins two complete sentences with a word like 'so,' and the comma goes right before that joining word. Here 'Emma forgot her notebook' and 'she borrowed a spare from a friend' are both complete on their own, so the correct choice puts a comma before 'so': 'Emma forgot her notebook, so she borrowed a spare from a friend.' The choice with no comma leaves the two complete sentences squeezed together with nothing to separate them. The choice with the comma after 'so' breaks up the joining word from the sentence it introduces, which is not where the comma belongs. The last choice adds a comma but drops 'so' into the wrong spot, so 'so' no longer joins the two sentences and the comma just creates a run-on. Only one choice both keeps 'so' as the joining word and places the comma directly in front of it.
- Where should the comma go? Sofia finished her book and she wrote a short review.
Answer: Sofia finished her book, and she wrote a short review.
This sentence joins two complete ideas with the word "and." Each idea could stand alone: "Sofia finished her book" and "she wrote a short review." When "and" joins two complete sentences like this, the comma goes right before "and." That is why "Sofia finished her book, and she wrote a short review" is correct. Putting the comma after "and" is wrong because the comma belongs before the joining word, not after it. Putting the comma after "wrote" is wrong because it splits the second idea apart in the middle. Putting the comma after "short" is wrong because it separates the describing word from the word it describes, "review." Only the comma placed just before "and" correctly shows where one complete idea ends and the next one begins.
- Combine these sentences into one sentence using a comma and the conjunction and, keeping the word then: Carlos cleaned his room. Then he played a game.
Answer: Carlos cleaned his room, and then he played a game.
In a compound sentence, the comma goes right before the joining word and, and the word then stays at the start of the second part. That is why 'Carlos cleaned his room, and then he played a game.' is correct. The choice 'Carlos cleaned his room and, then he played a game.' puts the comma after and instead of before it, so the comma is in the wrong spot. The choice 'Carlos cleaned his room and then, he played a game.' puts the comma after then, breaking up the second part instead of joining the two ideas. The choice 'Carlos, cleaned his room and then he played a game.' drops a comma between the person and what he did, which is never correct, and it never adds the comma before and where a compound sentence needs it. Only the first choice puts the comma before and and keeps then with the second part.
- Which sentence is punctuated correctly as a compound sentence with so?
Answer: Marcus forgot his library book, so he returned it the next day.
This question tests CCSS.L.4.2.c: using a comma before a coordinating conjunction in a compound sentence. Students must recognize compound sentences (two independent clauses joined by and/but/or/so) and place commas correctly. A compound sentence has two independent clauses (complete sentences) joined by a coordinating conjunction (FANBOYS: For, And, Nor, But, Or, Yet, So - focus on and, but, or, so for 4th grade). The rule is: use a comma BEFORE the coordinating conjunction when joining two independent clauses. Pattern: [Independent clause] , [conjunction] [independent clause]. Example: 'I love reading, and my sister loves math.' Both parts can stand alone as sentences ('I love reading' / 'my sister loves math'), so comma is needed before 'and.' DO NOT use comma in simple sentences with compound parts: 'I ran and jumped' (one subject, two verbs - no comma needed). In this sentence, there are two independent clauses: 'Marcus forgot his library book' and 'he returned it the next day' joined by 'so.' Since both parts can stand alone as complete sentences, this is a compound sentence that needs a comma before the conjunction. Choice A is correct because it places the comma before the coordinating conjunction 'so' in the compound sentence. The pattern is: Independent clause (Marcus forgot his library book) , so Independent clause (he returned it the next day). Both parts can stand alone as sentences, so comma is needed. Choice D represents adding comma in simple sentence, which occurs when students add comma in simple sentences with compound predicates thinking all sentences with 'so' need commas. Adding comma before 'so' in 'Marcus forgot his library book, so returned it the next day' is wrong because there's one subject - this is a simple sentence with compound predicate, not a compound sentence. To help students: Teach the 'independence test' - cover up one side of the conjunction. If the words before the conjunction can stand alone as a complete sentence AND the words after can stand alone as a complete sentence, it's compound and needs a comma before the conjunction. Practice identifying: (1) Find the conjunction (and, but, or, so). (2) Test both sides - can each stand alone? (3) If YES to both → compound → USE COMMA. If NO → simple sentence → NO COMMA. Common example: 'I ran home and ate dinner' - Test: 'I ran home' ✓ complete, but 'ate dinner' ✗ not complete (no subject), so this is simple sentence with compound predicate (one subject, two verbs) - NO COMMA. 'I ran home, and I ate dinner' - Test: 'I ran home' ✓ complete, 'I ate dinner' ✓ complete, so compound sentence - USE COMMA. Watch for: forgetting comma in compound sentences ('I ran fast and I won the race' needs comma), adding comma in simple sentences with compound parts ('I ran, and jumped' should not have comma - one subject), confusing compound subject/predicate with compound sentence (compound sentence has two complete thoughts, not just two subjects or two verbs), putting comma after conjunction instead of before. Create practice by having students identify independent clauses before adding punctuation.
- Fix the punctuation in this compound sentence: Sofia studied hard_ so she felt ready.
Answer: Sofia studied hard, so she felt ready.
A compound sentence joins two complete thoughts with a joining word like so. Both parts here can stand alone: 'Sofia studied hard' and 'she felt ready.' The rule is to put the comma BEFORE the joining word, so 'Sofia studied hard, so she felt ready.' is correct. The choice that puts the comma AFTER 'so' is wrong, because the comma belongs before the joining word, not after it. The choice with no comma at all is wrong, because a compound sentence needs a comma before 'so.' The choice with the comma after 'studied' is wrong, because it breaks up the first complete thought instead of separating the two clauses. To check yourself, find the joining word (and, but, or, so), then place the comma right before it.
- Which is the correct way to write this compound sentence with so?
Answer: Carlos was thirsty, so he drank a glass of water after recess.
This question tests CCSS.L.4.2.c: using a comma before a coordinating conjunction in a compound sentence. Students must recognize compound sentences (two independent clauses joined by and/but/or/so) and place commas correctly. A compound sentence has two independent clauses (complete sentences) joined by a coordinating conjunction (FANBOYS: For, And, Nor, But, Or, Yet, So - focus on and, but, or, so for 4th grade). The rule is: use a comma BEFORE the coordinating conjunction when joining two independent clauses. Pattern: [Independent clause] , [conjunction] [independent clause]. Example: 'I love reading, and my sister loves math.' Both parts can stand alone as sentences ('I love reading' / 'my sister loves math'), so comma is needed before 'and.' DO NOT use comma in simple sentences with compound parts: 'I ran and jumped' (one subject, two verbs - no comma needed). In this sentence, there are two independent clauses: 'Carlos was thirsty' and 'he drank a glass of water after recess' joined by 'so.' Since both parts can stand alone as complete sentences, this is a compound sentence that needs a comma before the conjunction. Choice B is correct because it places the comma before the coordinating conjunction 'so' in the compound sentence. The pattern is: Independent clause (Carlos was thirsty) , so Independent clause (he drank a glass of water after recess). Both parts can stand alone as sentences, so comma is needed. Choice C represents adding comma in simple sentence, which occurs when students add comma in simple sentences with compound predicates thinking all sentences with 'so' need commas. Adding comma before 'so' in 'Carlos was thirsty, so drank a glass of water' is wrong because there's one subject - this is a simple sentence with compound predicate, not a compound sentence. To help students: Teach the 'independence test' - cover up one side of the conjunction. If the words before the conjunction can stand alone as a complete sentence AND the words after can stand alone as a complete sentence, it's compound and needs a comma before the conjunction. Practice identifying: (1) Find the conjunction (and, but, or, so). (2) Test both sides - can each stand alone? (3) If YES to both → compound → USE COMMA. If NO → simple sentence → NO COMMA. Common example: 'I ran home and ate dinner' - Test: 'I ran home' ✓ complete, but 'ate dinner' ✗ not complete (no subject), so this is simple sentence with compound predicate (one subject, two verbs) - NO COMMA. 'I ran home, and I ate dinner' - Test: 'I ran home' ✓ complete, 'I ate dinner' ✓ complete, so compound sentence - USE COMMA. Watch for: forgetting comma in compound sentences ('I ran fast and I won the race' needs comma), adding comma in simple sentences with compound parts ('I ran, and jumped' should not have comma - one subject), confusing compound subject/predicate with compound sentence (compound sentence has two complete thoughts, not just two subjects or two verbs), putting comma after conjunction instead of before. Create practice by having students identify independent clauses before adding punctuation.
- Add a comma to make this a correct compound sentence: Jamal finished his math and he started reading.
Answer: Jamal finished his math, and he started reading.
When you join two complete sentences with a word like and, the comma goes right before that joining word. Jamal finished his math is a complete sentence, and he started reading is another complete sentence, so the comma belongs before and: Jamal finished his math, and he started reading. One choice puts the comma after and instead of before it, which is the wrong spot. Another choice puts a comma right after the name Jamal, breaking up the first sentence's subject from what it did. The last choice drops the comma in the middle of the phrase his math, which splits words that belong together. Only the version with the comma before and joins the two sentences correctly.
- Which is the correct way to write this compound sentence with or?
Answer: Amir can sit by the window, or he can sit near the door.
A compound sentence joins two complete sentences with a comma and a joining word like or. "Amir can sit by the window" and "he can sit near the door" are both complete sentences, so the comma goes right before or: "Amir can sit by the window, or he can sit near the door." One choice puts the comma after or instead of before it, which is the wrong spot. Another choice has no comma at all, so the two sentences run together. The last choice does put the comma before or, but it adds the extra word "too" at the end, which is not needed and makes the sentence awkward. Only the choice with the comma placed correctly before or, and nothing added, is right.
- Add a comma to make this a correct compound sentence: Jamal packed his lunch and he rode the bus.
Answer: Jamal packed his lunch, and he rode the bus.
This is a compound sentence: two complete sentences joined by the word 'and.' 'Jamal packed his lunch' can stand alone, and so can 'he rode the bus.' The comma goes right BEFORE the joining word 'and,' at the point where the two complete sentences meet. That is why 'Jamal packed his lunch, and he rode the bus.' is correct. The choice that puts the comma AFTER 'and' is wrong, because the comma belongs before the joining word, not after it. The choice with the comma after 'Jamal' is wrong, because it splits the subject from its own sentence and does not mark where the two sentences join. The choice with the comma after 'he' is wrong for the same reason, splitting the second sentence in the middle instead of marking the join. To check yourself: find the joining word (and, but, or, so), make sure a complete sentence sits on each side, then place the comma just before that joining word.
- Which sentence correctly punctuates this compound sentence: Jamal packed his lunch and he rode the bus?
Answer: Jamal packed his lunch, and he rode the bus.
A compound sentence needs a comma before the conjunction that joins two complete sentences, so the comma belongs before "and." Answer B is wrong because the comma comes after "and" instead of before it. Answer C is wrong because the comma breaks up the first complete sentence instead of joining the two parts. Answer D is wrong because the comma is placed inside the second sentence instead of between the two sentences.
- Which sentence uses commas correctly in a compound sentence with so?
Answer: Chen was tired, so he went to bed early last night.
A compound sentence joins two complete sentences with a joining word like so. Each part must be able to stand alone: "Chen was tired" and "he went to bed early last night" are both complete. The rule is to put the comma BEFORE the joining word. That is why "Chen was tired, so he went to bed early last night" is correct. The choice that puts the comma AFTER so, "Chen was tired so, he went to bed early last night," breaks the rule because the comma should come before the joining word, not after it. The choice with no comma at all, "Chen was tired so he went to bed early last night," forgets the comma that a compound sentence needs before so. The choice with two commas, "Chen was tired, so, he went to bed early last night," adds an extra comma after so; you only need one comma, and it goes before the joining word. Remember: find the joining word (and, but, or, so), check that both sides are complete sentences, then place one comma right before that word.
- Which sentence uses a comma correctly with the word and?
Answer: Yuki cleaned her desk, and she lined up quietly for lunch.
A comma belongs right before and when it joins two complete sentences, so the comma goes after desk in the correct choice. The first choice places the comma after and instead of before it, which is incorrect. The third choice places a comma in the middle of the first idea, splitting words that belong together. The fourth choice leaves out the comma completely, even though and is joining two complete sentences here.
- Which is the correct way to write this compound sentence with or?
Answer: Amir can draw a comic, or he can write a poem for class.
A compound sentence joins two complete sentences with a word like 'or.' Here, 'Amir can draw a comic' and 'he can write a poem for class' can each stand alone. When you join them with 'or,' you put the comma right before 'or.' The correct choice does exactly this: 'Amir can draw a comic, or he can write a poem for class.' One choice puts the comma after 'or' instead of before it, which is the wrong spot. Another choice has 'or' with no comma at all, so the two complete sentences are not separated. The last choice keeps the comma before 'or' but adds an extra comma after 'write,' which breaks up 'he can write a poem for class' where no comma belongs. Remember: use just one comma, and place it before the joining word 'or.'
- Fix the punctuation in this compound sentence: Sofia forgot her folder so she borrowed paper.
Answer: Sofia forgot her folder, so she borrowed paper.
This is a compound sentence: two complete thoughts, 'Sofia forgot her folder' and 'she borrowed paper,' joined by the word 'so.' The rule is to put the comma right before the joining word. The correct choice, 'Sofia forgot her folder, so she borrowed paper,' does exactly that. The choice 'Sofia forgot her folder so, she borrowed paper' puts the comma after 'so' instead of before it, which is the wrong spot. The choice 'Sofia forgot, her folder so she borrowed paper' drops the comma in the middle of the first thought, splitting words that belong together. The choice 'Sofia forgot her folder so she borrowed, paper' puts the comma between 'borrowed' and 'paper,' breaking up the second thought instead of marking where the two thoughts join. To check yourself, find the joining word (and, but, or, so), make sure a complete sentence sits on each side, then place the comma just before that joining word.
- Which sentence uses commas correctly for a compound sentence with "so"?
Answer: It was windy, so Keisha held her hat on the walk home.
A compound sentence joins two complete sentences with a word like "so." Here both parts stand alone: "It was windy" and "Keisha held her hat on the walk home." The rule is to put the comma BEFORE "so." The correct choice, "It was windy, so Keisha held her hat on the walk home," does exactly that. The choice with the comma after "so" ("It was windy so, Keisha...") puts the comma in the wrong place — it goes before the joining word, not after it. The choice with no comma at all ("It was windy so Keisha...") forgets the comma that a compound sentence needs. The choice with a comma both before and after "so" ("It was windy, so, Keisha...") adds an extra comma; you only need one, and it belongs before "so." Remember: pause with a comma right before "so" when it links two complete sentences.
- Which sentence uses commas correctly with so in a compound sentence?
Answer: Keisha was thirsty, so she drank water after gym class.
This question tests CCSS.L.4.2.c: using a comma before a coordinating conjunction in a compound sentence. Students must recognize compound sentences (two independent clauses joined by and/but/or/so) and place commas correctly. A compound sentence has two independent clauses (complete sentences) joined by a coordinating conjunction (FANBOYS: For, And, Nor, But, Or, Yet, So - focus on and, but, or, so for 4th grade). The rule is: use a comma BEFORE the coordinating conjunction when joining two independent clauses. Pattern: [Independent clause] , [conjunction] [independent clause]. Example: 'I love reading, and my sister loves math.' Both parts can stand alone as sentences ('I love reading' / 'my sister loves math'), so comma is needed before 'and.' DO NOT use comma in simple sentences with compound parts: 'I ran and jumped' (one subject, two verbs - no comma needed). In this sentence, there are two independent clauses. The first independent clause is 'Keisha was thirsty' and the second independent clause is 'she drank water after gym class' joined by 'so'. Since both parts can stand alone as complete sentences, this is a compound sentence that needs a comma before the conjunction. Choice B is correct because it places the comma before the coordinating conjunction 'so' in the compound sentence. The pattern is: Independent clause (Keisha was thirsty) , so Independent clause (she drank water after gym class). Both parts can stand alone as sentences, so comma is needed. Choice A represents comma in wrong position, which occurs when students put comma after conjunction instead of before. The comma must come BEFORE the conjunction, not after. To help students: Teach the 'independence test' - cover up one side of the conjunction. If the words before the conjunction can stand alone as a complete sentence AND the words after can stand alone as a complete sentence, it's compound and needs a comma before the conjunction. Practice identifying: (1) Find the conjunction (and, but, or, so). (2) Test both sides - can each stand alone? (3) If YES to both → compound → USE COMMA before conjunction. If NO → simple sentence → NO COMMA.
