N + whose + N 

N (người) + who + V .

N (người) + whom + S + V 

N (lý do) + why + S  + V 

N (thời gian) + when + S+ V 

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3. They volunteer to help the victims whose houses were destroyed by a flood.

4. Joan whose colleagues were waiting for him there was planning to go to the conference.

5. This waitress who was very impolite and impatient served us.

6. I met Alice's father, who was working at the university, at the conference yesterday.

7. The film The Dark which she watched last night terrified her a lot.

8. A building which has now been rebuilt was destroyed in the fire.

9. John Bridge, who has just gone to live in Canada, is one of my oldest friends.

10. The birds whose nest I found in the tree behind my house have flown away.

11. He is curious about the reason why she has been sad in recent days.

12. Many rivers which caused serious diseases to people using the river water around the world are polluted.

13. We are moving to Manchester which is in the North-West. 

14. He isn't looking forward to the time when he will have to leave.

15. The biggest city in Brazil is Sao Paulo whose population is over five million.

16. That's the girl whom Fred and Tom were talking about.

17. Do you know the woman who made very interesting speech last night?

18. I have some letters which must be written today.

19. John, who left the room, was the last person.

20. He who interviews yesterday was the most intelligent man.

`color{orange}{~MiaMB~}`