At the end of a declarative sentence. (makes a statement)

Ex. My brother delivers newspapers.

At the end of an imperative sentence. (requests or tells someone to do something)

Ex. Please close the door.

At the end of an indirect question.Ex. She asked us if we liked strawberries.

after an abbreviation or initial.Ex. Dr. Marla E. Henderson

P. O. Box 2:30 P. M. after each number or letter that shows a

division of an outline or precedes an item in a list.

Ex. 1. eggs 2. milk

in numerals between dollars and cents.Ex. $19.55

at the end of an interrogative sentence (asks a question)

Ex. Has anyone seen my dog? What are you doing afterschool?

at the end of an exclamatory sentence (expresses strong emotion)

Ex. Tim, look out!

after an interjection or after any other exclamatory expression.

Ex. Hurrah! Wow!