Whose ball is this?
This is his ball.
Whose bike is this?
This is her bike.
Whose roller skates are these?
These are his roller skates.
Whose hula hoop is this?
This is her hula hoop.
Whose ring is this?
This is his ring.
Whose swords are these?
These are her swords.
Whose flowers are these?
These are his flowers.
Whose cannon is this?
This is my cannon!