1. He arrived with a friend who waited outside in the car.

2. The man whose mobile was ringing did not know what to do.

3. The car which the robbers escaped in was a BMW.

4. The woman whose daughter was crying tried to calm her down.

5. The postman whowho works in the village is very old.

6. The family whose car was stolen last week is the Smiths.

7. The cowboy who is wearing a red shirt looks very funny.

8. A bus is a big car which carries lots of people.

9. The volunteers, whosewhose enthusiasm was obvious, finished the work quickly.

10. Children who like music are often good at mathematics.

11. The engineers who designed the building 

` 1`. who

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` -----------------`

` -` who : chỉ người

` -` which : cái nào, thứ nào, ...

` -` whose : của ai, của cái gì, ..