Punctuation: End Marks and Commas

1. Declarative, abreviations and some imperative sentences are followed by a period.
Ex. She won.

2. An interrogative sentence is followed by a question mark.
Ex. Are you there?

3. Exclamations and some imperative sentences are followed by an exclamation mark.
Ex. Close that door!

4. Use commas to separate items, adjectives, and independent clauses.
Ex. They brought chips, soda, and ice cream.

5. Use commas to set off nonessential clauses, nonessential participial phrases, sentences interrupters, appositives, appositive phrases, words used in direct address, and parenthetical expressions.
Ex. Ana, hoping to win, tried her best.

6. Use commas in certain conventional situations.
Ex. Ana Harris, Ms.

7. Use a comma after an introductory element.
Ex. No, they're not attending.