Shark Learning
Grade 4/Punctuation

Commas in Compound Sentences (1425)

Students rewrite compound sentences by adding the comma that belongs before the coordinating conjunction (for, and, but, or, yet, so, nor — FANBOYS). A critical GR4 skill that distinguishes compound sentences from simple sentences with compound predicates.
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Quick Tip
Compound sentence (two complete thoughts joined by and, but, or, so, yet): add a comma before the joining word.
Teacher Resources
Teaching Notes

Test if both sides are complete sentences: cover each half and ask "Does it make sense alone?" If yes — it's a compound sentence and needs the comma.

Vocabulary
comma: A punctuation mark separating clauses in a sentence.
compound sentence: Two complete sentences joined by a conjunction.
Common Mistakes
  • Adding comma before "and" in a simple sentence with a compound predicate (e.g., "She ran and jumped" — NO comma needed)
  • Missing the comma when the conjunction is at the start
Differentiation
SupportDraw a "bridge" over the conjunction — the comma is the "toll booth" on the bridge.
ChallengeWrite 3 compound sentences from your own experience using 3 different conjunctions.
Extension Activities
  • Write compound sentences.
  • Identify conjunctions.
  • Practice joining ideas.
Parent Tip

Ask your child to combine two simple sentences into one.

Learning Path
Skill Level

intermediate

Estimated Time

15 minutes

Skills Practiced
commas compound sentences
Prerequisites
  • commas_direct_address
  • commas_in_list