Knowing when to use a comma can be difficult. Here are 5 tips to help you decide when to use a comma and when not to use a comma. Use commas to separate independent clauses when they are joined by any of these seven coordinating conjunctions: and, but, for, or, nor, so, yet.
Example: The game was over, but the crowd refused to leave.
- Use a comma after introductory clauses that come before the main clause.
Example: While I was eating, the cat scratched at the door.
- Use a comma after introductory phrases that come before the main clause.
Example: Having finished the test, he left the room.
- Use a comma after introductory words that come before the main clause.
Example: Yes, the package should arrive tomorrow morning.
- Use a pair of commas in the middle of a sentence to set off clauses, phrases, and words that are not essential to the meaning of the sentence. Use one comma before to indicate the beginning of the pause and one at the end to indicate the end of the pause.
Clause: That Tuesday, which happens to be my birthday, is the only day when I am available to meet.
Phrase: This restaurant has an exciting atmosphere. The food, on the other hand, is rather bland.
Word: I appreciate your hard work. In this case, however, you seem to have over-exerted yourself.