The main use of the apostrophe is to form the possessive case of most nouns by adding an apostrophe or an apostrophe and 's'. See also Possessives for more information. Punctuation used to denote a sudden change or break in a sentence, e.g. He was gone — heaven forbid — for an hour and no one knew where he was. Spaces may or may not be added before or after a dash, but the use of spaces must be consistent. Do not combine a dash with a colon, comma, or semicolon. Apply the following rules when using the apostrophe.

To begin, find out about the purposes for which the apostrophe is used. Click on a link below to read the rules and see examples, take a guided tour by clicking the 'start' button below.