Ответ:
1. You aren't an engineer. Are you an engineer?
2. His little brother isn't a schoolboy. Is his little brother a schoolboy?
3. Her parents aren't at home.Are her parents at home?
4. Our teacher isn't at the library. Is our teacher at the library?
5. The cars aren't in the street.Are the cars in the street?
6. The theatre isn't in the center of the town. Is the theatre in the centre of the town?
7. My cousin isn't at school. Is my(your) cousin at school?
8. They aren't good sportsmen. Are they good sportsmen?
9. His father isn't a worker. Is his father a worker?
10. The street isn't narrow. Is the street narrow?
11. This film isn't dull. Is this film dull?
12. Your dog isn't old. Is your dog old?
13. The girl isn't in the swimming pool. Is the girl in the swimming pool?
14. The reading-hall isn't cosy.Is the reading room cosy?