Possessive apostrophes come at the end of nouns that show ownership (possession) or a close relationship like among family members or body parts. The “owner” noun always precedes the noun it relates to, but any adjective that describes the second noun goes in between the two nouns.

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.

Here are the rules that will apply: Rule one: If possessive noun is singular, then you need to add apostrophe plus “s”. Rule two: If possessive noun is not ending with the letter “s”, then you always need to add apostrophe plus “s”. Rule three: If possessive noun ends with the “s” and it is plural, what you only need to do is to add apostrophe.

A great way to remember the possessive apostrophe rules is to remember these three things: For single nouns, add an apostrophe and an 's'. For plural nouns, just add an apostrophe after the 's'. If it's a personal possessive pronoun, it doesn't need an apostrophe at all.