1. This is a house.
2. This is the house in which I live.
3. This is butter.
4. This is the butter I bought for you.
5. My father is a worker.
6. His father is the worker who improved this machine.
7. This man is the attorney I told you about.
8. Ann's mother is an investigator.
9. His wife is a doctor.
10. His wife is the doctor who treated my sister.
11. February is the shortest month.
12. July is the seventh month of the year.
13. It isan Indian film.
14. It is the film we discussed yesterday.
15. Cow is a domestic animal.
16. Carrot is a vegetable.
17. Carp is a fish.