Possessives take many forms in English.
Pronouns in the possessive case can be used as adjectives to modify nouns or stand alone as subjects, objects or complements.
For example,
My book is on the table.
(used to modify a noun)
Mine is on the table.
(used as a subject)
I put mine in the refrigerator.
(used as an object)
The red one is mine.
(used as a complement)
See the table below:
Pronouns as adjectives
Pronouns as subjects, objects
and complements
my
mine
his
his
her
hers
its
its (not common)
your
yours
our
ours
their
theirs
The possessive is formed by adding ?s to singular nouns and plural nouns
not ending in s. Such possessives can be used as modifiers, or they can
stand alone.
It is John's bicycle.
Those are the children's toys.
Jack's is the white one.
I'm going to Joe's.
With plural nouns ending in ?s, only an apostrophe (?) is used to form the
possessive.