Here are some general rules for using possessive nouns: General Rules For singular nouns, add ‘s at the end of the noun. Example: “The dog’s bone.” For plural nouns that do not end in s, add ‘s at the end of the noun. Example: “The children’s toys.” For plural nouns that end in s, add only an apostrophe at the end of the noun.

Typically, singular possessive nouns use an apostrophe (’) and the letter s at the end of the word to take the possessive form. Almost any noun can become possessive, even abstract nouns. dog -> dog’s Maria -> Maria’s the Empire State Building -> the Empire State Building’s