1. The house which was built last year has been burned down.(the house built last year was burned down.)
2. The city we live in is very cold.
3. Can you show me the sweater you bought yesterday?/Can I have a look at the sweater you bought yesterday?
4. The man who is talking to my mather is my father.
5. I will tell you all what I know.
6. The boy who was playing with me just now is from Class 3.
7. The girl you met on the street yesterday is Mary.
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