When do You Use An Apostrophe?

There are several scenarios where you can use an apostrophe. You would use an apostrophe to form possessive nouns (Bob’s dog), for contractions (wasn’t), and to show plural possessive (the Joneses’ house). Look here for more information: The apostrophe has three uses: 1) to form possessives of nouns 2) to show the omission of letters 3) to indicate certain plurals of lowercase letters.