Rule #1: Use an apostrophe + -s at the end of a noun to show singular possession of something. When a single someone or something has possession of another object, you simply add an apostrophe -s to the end of the word. For example: The ball that belongs to Jim = Jim’s ball The kite that belongs to Sara = Sara’s kite

A possessive apostrophe is an apostrophe used in a noun to show that the noun owns something (e.g., woman's hat). More specifically, a possessive apostrophe and the letter s are added to a noun to make the noun possessive. For example: Simon's car the dog's bone the fairies' village

To show possession when the noun is plural and already ends in 's', you just add an apostrophe to the end of the word. You don't need to add an extra 's'. For example: The brothers' feet were muddy. The girls' bathroom was a mess.