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1. A thief is person who steals things.
2. The people who are very friendly work in a hospital.
3. The man who told me you were out answered the phone.
4. I know somebody that knows you.
5. A waitress, who served us, was very impolite and impatient
6. That man is a man whom I want to see.
7. Lan's brother ,whom my father invited to have dinner last week, went to Ha Noi yesterday.
8. They went to see a doctor from whom their children needed to help .
9. An Aeroplane is machine that I can fly.
10. Jack lives in house which is over 600 years old.