Make the following interrogative and negative.
1. You are an engineer. 2. His little brother is a school¬boy. 3. Her parents are at home. 4. Our teacher is at the library. 5. The cars are in the street. 6. The theatre is in the center of the town. 7. My cousin is at school. 8. They are good sportsmen. 9. His father is a worker. 10. The street is narrow. 11. This film is dull. 12. Your dog is old. 13. The girl is in the swimming pool. 14. The reading-hall is cosy.