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Commas in Compound Sentences is a free printable Grade 4 English worksheet on the comma before and, but and so in a compound sentence, aligned to Common Core standard L.4.2. It prints 7 questions with an answer key on its own sheet of paper, in 25 versions that each ask different questions, so no two students in the class work from the same page. Print it from the browser or download it as a PDF — no account, no email.

Set 20 of 25 · the same problems every time you open this link.

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Set 1 has all 25 in a single PDF. All 25 sets ask different questions.

Commas in Compound Sentences

L.4.2

NameDate

Rewrite each sentence correctly.

1.commas

Lichens absorb what is in the air so they vanish where it is dirty.

2.commas

We could walk to the park or we could take the bus.

3.commas

It was getting dark so we lit the fire.

4.commas

You can have the red one or you can have the green one.

5.commas

The polyps expel the algae and the coral turns white.

6.commas

The road was icy but the bus still arrived on time.

7.commas

I wanted to swim but the pool was closed.

LessonPrint · L.4.2 · Set 20 · free to copy for classroom use

Answer key — Commas in Compound Sentences

Set 20. Prints on its own sheet.

  1. 1.Lichens absorb what is in the air, so they vanish where it is dirty.
  2. 2.We could walk to the park, or we could take the bus.
  3. 3.It was getting dark, so we lit the fire.
  4. 4.You can have the red one, or you can have the green one.
  5. 5.The polyps expel the algae, and the coral turns white.
  6. 6.The road was icy, but the bus still arrived on time.
  7. 7.I wanted to swim, but the pool was closed.

Last reviewed 2026-09-05. Aligned to L.4.2 of the Common Core State Standards for English Language Arts.