4th grade commas in compound sentences worksheets
A compound sentence joins two complete thoughts with a coordinating conjunction, and a comma marks the seam: the bell rang, but nobody moved. Fourth graders test each half: if both could stand alone, the comma goes before the joining word.
Free printable PDF worksheet, aligned to Common Core L.4.2.c.
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The kind of sentences you'll fix
Add the missing comma to each sentence.
-
The cake collapsed yet it tasted wonderful.
Fixed: The cake collapsed, yet it tasted wonderful.
- The siren wailed and every dog on the block answered.
- The essay was hard but the ending felt right.
Every print pulls a fresh set of sentences at this level, so a make-up test or a second sibling never gets the same sheet.
What's on each sheet
- Fix it. Add the missing comma to each sentence. 8 sentences to fix per page.
- Choose the sentence. Circle the letter of the sentence with the comma in the right place. 8 questions per page.
Every version prints on US Letter or A4, with its answer key on the last page.
How to teach this
Teach the two-thumbs test: cover each half of the sentence and ask whether it could stand alone. Two yeses mean a comma before the conjunction. The wrong option with the comma after the conjunction (rained so, we) reads strangely aloud, so hearing the options is a dependable check.
Watch for: The comma goes before the conjunction, never after it: rained, so we (not rained so, we). If the second half can't stand alone (I ran and jumped), no comma is needed.
Common questions about commas in compound sentences
- When does "and" need a comma before it?
- When it joins two complete sentences: Dad cooked dinner, and I washed the dishes. Each half stands alone. If the second part can't stand by itself (Dad cooked dinner and hummed), no comma is needed. The stand-alone test settles every case.
- What are the joining words to watch for?
- And, but, or, so, and yet are the ones on these worksheets; teachers often add for and nor to complete the famous FANBOYS set. Whichever conjunction appears, the comma's place never changes: right before it, never after.
Related worksheets
- 5th grade commas in compound sentences A step harder, same skill
- 4th grade contractions Same grade, nearby skill
- 4th grade quotation marks in dialogue Same grade, nearby skill
- Commas in compound sentences, all grades The full progression
- All 4th grade English worksheets Every skill at this level
- All 4th grade worksheets Everything at this level
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Aligned to Common Core L.4.2.c. Reviewed by the One more sheet team. Content version 137, updated August 2026.
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