Whose key is it? (they)
It is theirs.
Whose cat is it? (we)
It is ours.
Whose glasses are they? (me)
They are mine.
It is his hamburger.--->
It is his.
Whose glasses are they? (Peter)
They are Peter's.
It is her phone.--->
It is hers.
Whose ring is it? (me)
It is mine.
Whose coin is this? (he)
It is his.
It is our cake!--->
It is ours.
It is your cockroach. --->
It is yours.
They are their fish.--->
They are theirs.
Whose pencil box is it? (she)
It is hers.
Whose scissors are they? (we)
They are ours.
They are my cats.--->
They are mine.
They are my coins.--->
They are mine.
Whose flute is this? (she)
It is hers.