1.They aren't doctor's.
Are they doctors?No,they aren't.
2. isn't a good player.
Is Peter a good player?Yes,he is.
3.Ply mother isn't in the daeroon.
Is Ply mother in the daeroon?No,she isn't.
4.The books aren't on the clesr.
Are the books on the cleser? Yes,they are.
5.We aren't friends.
Are we friends?Yes,we are.