7. my father who works at the office is not at home.

→ thay thế "my father" bằng "who", 

cấu trúc: ...N(person)+ who + V + O

8. Ms. Kim Anh, whom you talked with yesterday, will be our history teacher next semester.

→thay thế " Ms. Kim Anh" bằng "whom"

cấu trúc: ...N(person) + whom + S + V 

9. the watch which belongs to Lam is looking for it.

→thay thế "the watch" bằng "which"

cấu trúc: ...N(thing) + which + V + S 

10. do you know the new student whose name i can't remember ?

→thay thế "the new student" bằng "whose" 

cấu trúc:...N(person, thing) + whose + N + V

11.  mary whose didn't hear the phone, is a bit deaf

→thay thế "mary" bằng "whose"

cấu trúc:...N(person, thing) + whose + N + V

12. we are talking about a computer which costs a lot of money

→thay thế " a computer" bằng "which"

cấu trúc:...N(thing) + which + V + S 

13. i should phone the man whose car I borrowed yesterday

→thay thế "the man" bằng "whose"

cấu trúc:...N(person, thing) + whose + N + V

14. she can't speak english, which is a disadvantage

→thay thế "english" bằng "which"

cấu trúc: ...N(thing) + which + V + S

15. do you remember the teacher who taught us history 

→thay thế "the teacher" bằng "who"

cấu trúc: ...N(person)+ who + V + O