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Period
A period is used at the end of a sentence. A period has other important uses, too.
A period after a sentence acts like a stop sign.
At the End of a Sentence
Use a period at the end of a sentence that makes a statement.
A statement ends with a period. (statement)
Also use a period at the end of a request or a command.
Please end a request with a period. (request)
Use a period with a command. (command)
After an Initial
Use a period after an initial in a person’s name.