The genitive case

The genitive case, or possessive case, is when the apostrophe s ('s) is used to show possession (my grandmother’s ring, my sister’s car). The genitive case is used mainly with people and animals; it is rarely used with non-living things. However, sometimes it is used with organizations or companies.

How to use the genitive case

Singular noun Add ’s (apostrophe S) The museum’s new exhibit was fascinating.
Singular noun
(ending in S)
Add ’s (apostrophe S) after names or common nouns. James’s new job pays quite well.

The bus’s wheels were flat.

Jesus’s birthday is Christmas.
Plural noun Add only the apostrophe My sisters art project is finally finished.
Plural noun
(not ending in S)
Add ’s (apostrophe S) My children’s teacher is very kind.
No noun If the meaning is clear, sometimes the possessive is used without a repeated noun. The possessive will usually be on a name. My bike is older than Sarah’s.

Taylor’s house is bigger than Mike’s.