How do you use the word apostrophe in a sentence?

An apostrophe is used, alone or with an S, to make a noun possessive.

Example sentence: Jim's father fixed my bicycle. (the father of Jim)

An apostrophe is used to form a contraction, taking the place of some letters left out from one of the joined Words.

Example sentence: They've finally repaired the potholes. (they have)

The same symbol on a keyboard is used for the apostrophe and the single quotation mark.