A practical english grammar - Vyssaja skola 1978

Possessive pronouns
Sound symbols

The forms of the possessive pronouns are given in Table 2-1. The first possessive is the form used before nouns; the second possessive is used when no noun follows.

My hat is on the table.  Yours is on the chair.

Where’s your book?  Mine is on my desk.

Their car is outside.  Ours is in the garage.

To express the fact of ownership, we use be + the 2nd possessive.

This car is mine.

That book is his.

Is this hat yours?

The gender and number of the object or objects possessed has no effect on the form of these possessive words. The form is determined entirely by the number (and gender, in the case of third person singulars) of the possessor.