1.Are you an engineer? You are not an engineer. 2. Is his little brother a schoolboy? His little brother is not  a schoolboy. 3. Are her parents at home? Her parents are not at home. 4. Is our teacher at the library? Our teacher is not at the library. 5. Are the cars in the street? The cars are not in the street. 6. Is the theatre in the centre of the town? The theatre is not in the centre of the town. 7. Is my cousin at school? My cousin is not at school. 8. Are they good sportsmen? They are not good sportsmen. 9. Is his father a worker? His father is not a worker. 10. Is the street narrow? The street is not narrow.