How do you punctuate a possessive noun?

Answer 1

A possessive noun is formed by adding an apostrophe -s to the end of a word, or just the apostrophe to the end of some nouns that already end with -s; for example:

• Julie's bed
• Chase's ball
• the cat's whiskers
• the boss's desk
• the pants' pockets
• the glass's crack
• the glasses' frame
• the boys' bikes

Answer 2

To punctuate a possessive noun, add an apostrophe ('s) at the end of the word if it is singular. If the noun is plural and already ends in an "s," just add an apostrophe (') after the "s". If the noun is plural and does not end in an "s," add an apostrophe ('s) after the word.