Pluralization for possesive

Answer 1

A possessive noun can be singular or plural:

• a singular noun forms its possessive by adding an apostrophe s ('s) to the end of the noun;
• a plural noun forms its possessive by adding just an apostrophe (') to the end of a plural noun that ends with an s, or an apostrophe s ('s) to the end of a plural noun that does not end with an s.

Examples:

the boy's locker (singular)

The boys' locker room (plural)

a child's toy (singular)

the children's playground (plural)

the doctor's office (singular)

the doctors' clinic (plural)

Answer 2

To pluralize a possessive noun, you typically add an apostrophe and an "s" after the plural noun, such as "dogs' toys" or "cats' beds." If the plural noun already ends in "s," you just add an apostrophe, like "students' books."