Commas with compound and complex sentences
key notes :
In a compound sentence, use a comma before the coordinating conjunction that joins the two independent clauses. Examples of coordinating conjunctions are and, or, but and so.
We saw a flash of lightning, and seconds later we heard the rumble of thunder.
In a complex sentence, if a dependent (or subordinate) clause comes before an independent (or main) clause, use a comma after the dependent clause. A dependent clause is one that starts with a subordinating conjunction, such as after, although, as, because, before, if, since, unless, until, when, or while.
If she ever gets the chance, Terri would love to visit the Egyptian pyramids.
Learn with an example
🏫 Correct the sentence by adding one comma.
🏫 The make-up artist demonstrated his skills at the trade show and he answered questions afterwards in the lobby.
- This is a compound sentence, so use a comma before the coordinating conjunction and, which joins the two independent clauses.
- The make-up artist demonstrated his skills at the trade show, and he answered questions afterward in the lobby.
🏫 Correct the sentence by adding one comma.
🏫 Unless Lucy creates a budget for her trip she’ll have trouble managing her expenses.
- This is a complex sentence in which a dependent clause comes before an independent clause. You can tell because the first clause starts with a subordinating conjunction, unless. Use a comma after the dependent clause.
- Unless Lucy creates a budget for her trip, she’ll have trouble managing her expenses.
🏫 Correct the sentence by adding one comma.
🏫 While Foxy is not an obedient dog he is friendly with everyone.
- This is a complex sentence in which a dependent clause comes before an independent clause. You can tell because the first clause starts with a subordinating conjunction, while. Use a comma after the dependent clause.
- While Foxy is not an obedient dog, he is friendly with everyone.
Let’s practice!🖊️
