1. (-) Those aren't his books and pencils.
(?) Are those his books and pencils?
2. (-) My father isn't an engineer.
(?) Is your father an engineer?
3. They aren't nurses.
Are they nurses?
4. (-) This isn't my brother.
(?) Is this your brother?
5. (-) You aren't a teacher.
(?) Are you a teacher?
6. (-) She isn't my sister.
(?) Is she your sister?