The Period

• Use a period at the end of every sentence that states an idea or command.

She is a sophomore. He asked why she left early. Open your books.

• Use periods in abbreviations according to conventional rules. A period is conventionally used in abbreviations such as the following:

Mr.

B.A.

B.C.

i.e.

A.M.

Mrs.

M.A.

B.C.E.

e.g.

(or a.m.)

Ms.

Ph.D.

A.D.

etc.

P.M.

Jr.

R.N.

C.E.

p.

(or p.m.)

• If a sentence ends with a period marking an abbreviation, do not add a second period.

Anna often heard the king end his sentences with etc.

• U.S. Postal Service abbreviations do not use periods.

• Usually a period is not used in abbreviations of organization names.

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