Whose cap is this?
It's Mark's cap
Whose rulers are these?
They're Susan's rulers
Whose doll is this?
It's Susan's doll
Whose dog is this?
It's Susan's dog.
Whose apple is this?
It's Susan's apple
Whose dress is this?
It's Susan's dress
Whose ball is this?
It's Mark's ball
Whose cat is this?
It's Mark's cat
Whose glasses are these?
They're Mark's glasses
Whose books are these?
They're Mark's books
Whose crayons are these?
They're Mark's crayons
