Here are some common uses for commas:

1. A comma is used after the words “yes” and “no” when they are used as an answer to a question.

Example: Yes, you can have a snack.
The word “yes” in this sentence answers a question, even though the question is not included. Do not use a comma after “yes” or “no” when they are not being used to answer a question.

2. A comma comes after an introductory word or phrase.

Example: Surprisingly, our team came back and won the game!
Example: If you are late, you won’t get to see the movie.

An introductory word or phrase introduces the sentence. The word or phrase cannot stand on its own.

3. A comma comes before a question at the end of a sentence.

Example: Don’t stay up too late, okay?
This sentence includes a statement and a question at the end. The comma comes before the question.

4. A comma comes before or after the name of person being spoken to in a sentence.
Example: Joe, are you in there?
Example: Are you in there, Joe?
In this sentence, Joe is being addressed, or talked to. Use a comma only in sentences where a person is directly being addressed.