11. That's the woman about whom I was telling you.

12. The person whom we adore most is my mother.

13. The man whose opinion I respect most is my father.

14. My likes to travel at night when the roads are quiet.

15. Mary and Margaret, whom you met yesterday, are twins.

16. The reason why I'm phoning you is to invite you to my party.

17. I'll introduce you to the man whose support is necessary for your project.

18. The middle-aged man to whom my father is talking is the director.

19. Mr.Mark, to whom I spoke on the phone last night, is interested in our plan.

20. Mary tried on three jackets, none of which fitted him.

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Xác định từ thay thế ở câu trước và câu sau.

Xác định được từ dùng để thay thế.

Who: người
Which: vật
Where: địa điểm
Why: lí do (có reason thì dùng)
That: người, vật
When: thời gian