3. 1)I wasn't John's wife. 2) My grandparents weren't poor. 3) Susan wasn't a fat girl. 4) My hair wasn't short. 5) We weren't artists. 6) They weren't husband and wife.
4. 1)he wasn't. 2) I weren't. 3) I was. 4) he wasn't. 5) it was. 6) she was. 7) they weren't. 8) she wasn't. 9) I was. 10) it was.