A possessive form is a word or grammatical construction used to indicate a relationship of possession in a broad sense.

In English, for example, possessive forms derived from other pronouns include one's, somebody's and nobody's.

When a personal pronoun comes in front of a gerund, the possessive form is called for: say my, not me.

Reflexives may be formed by adding selves after any of the possessive forms.

As a result, many (but not all) are named in the possessive form.

Personal pronouns are also often associated with possessive forms.

However, the personal pronouns do have distinct possessive forms.

Some of the English indefinite pronouns above have possessive forms.

They work the same way as the patrynomic, and are possessive forms of given names.

There is no standard way of forming the possessive form of y'all.