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: 'Sofia studied hard' and 'she felt ready' 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 (Sofia studied hard) , so Independent clause (she felt ready). Both parts can stand alone as sentences, so comma is needed. Choice C represents missing comma in compound, which occurs when students forget to add comma before conjunction in compound sentences. Without the comma, the compound sentence is incorrectly punctuated. 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.

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: 'Jamal finished his homework' and 'he played basketball afterward' 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 (Jamal finished his homework) , and Independent clause (he played basketball afterward). Both parts can stand alone as sentences, so comma is needed. Choice C represents missing comma in compound, which occurs when students forget to add comma before conjunction in compound sentences. Without the comma, the compound sentence is incorrectly punctuated. 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.

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 'Emma forgot her notebook' and the second independent clause is 'she borrowed paper from a friend' 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 (Emma forgot her notebook) , so Independent clause (she borrowed paper from a friend). Both parts can stand alone as sentences, so comma is needed. Choice A represents missing comma in compound sentence, which occurs when students forget to add comma before conjunction in compound sentences. Without the comma, the compound sentence is incorrectly punctuated. 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: forgetting comma in compound sentences (Choice A), putting comma after conjunction instead of before (Choice C), or creating a run-on sentence without the conjunction (Choice D).

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: 'Jamal finished his homework' and 'he played basketball afterward' 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 (Jamal finished his homework) , and Independent clause (he played basketball afterward). Both parts can stand alone as sentences, so comma is needed. Choice C represents missing comma in compound, which occurs when students forget to add comma before conjunction in compound sentences. Without the comma, the compound sentence is incorrectly punctuated. 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.

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]. In this sentence, there are two independent clauses. The first independent clause is 'Maya wanted to play outside' and the second independent clause is 'it started to rain after school' joined by 'but'. 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 'but' in the compound sentence. The pattern is: Independent clause (Maya wanted to play outside) , but Independent clause (it started to rain after school). Both parts can stand alone as sentences, so comma is needed. Choice A represents missing comma in compound sentence, which occurs when students forget to add comma before conjunction in compound sentences. Without the comma, the compound sentence is incorrectly punctuated. 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: forgetting comma in compound sentences, putting comma after conjunction instead of before (Choice C), or creating a run-on sentence without the conjunction (Choice D).

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: 'Sofia studied hard' and 'she felt ready' 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 (Sofia studied hard) , so Independent clause (she felt ready). Both parts can stand alone as sentences, so comma is needed. Choice C represents missing comma in compound, which occurs when students forget to add comma before conjunction in compound sentences. Without the comma, the compound sentence is incorrectly punctuated. 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.

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: 'Yuki wanted the blue marker' and 'Chen wanted it too,' joined by 'but.' The first independent clause is 'Yuki wanted the blue marker' and the second independent clause is 'Chen wanted it too' joined by 'but.' 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 'but' in the compound sentence. The pattern is: Independent clause (Yuki wanted the blue marker) , but Independent clause (Chen wanted it too). Both parts can stand alone as sentences, so comma is needed. Choice B 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. 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.

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 'Amir fed the fish' and the second independent clause is 'the tank stayed clean' 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 (Amir fed the fish) , so Independent clause (the tank stayed clean). Both parts can stand alone as sentences, so comma is needed. Choice B 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.

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. In this sentence, there are two independent clauses. The first independent clause is 'Jamal packed his lunch' and the second independent clause is 'he rode the bus' 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 A is correct because it places the comma before the coordinating conjunction 'and' in the compound sentence. The pattern is: Independent clause (Jamal packed his lunch) , and Independent clause (he rode the bus). Both parts can stand alone as sentences, so comma is needed. Choice B 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: 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. Common errors include placing commas randomly within clauses (Choices C and D) or after the conjunction (Choice B). Create practice by having students identify independent clauses before adding punctuation.

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. The conjunction "or" presents a choice between two options. In this sentence, there are two independent clauses. The first independent clause is "You can borrow my markers" and the second independent clause is "you can use your crayons today" joined by "or". 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 "or" in the compound sentence. The pattern is: Independent clause (You can borrow my markers) , or Independent clause (you can use your crayons today). Both parts can stand alone as sentences, so comma is needed. Choice C represents missing comma in compound sentence, which occurs when students forget to add comma before conjunction in compound sentences. Without the comma before "or", the compound sentence is incorrectly punctuated. To help students: Teach that "or" follows the same comma rule as "and" and "but" when joining complete sentences. Independence test: "You can borrow my markers" ✓ complete sentence, "you can use your crayons today" ✓ complete sentence, so comma needed before "or". Watch for: students thinking "or" doesn't need a comma because it's presenting options - remind them the rule depends on whether both parts are complete sentences, not on the meaning. Common confusion: "You can borrow markers or crayons" (no comma - one subject, compound object) vs. "You can borrow my markers, or you can use your crayons" (comma - two complete sentences).