9. The doctor who you visited yesterday is famous

10. The student who sits next to me is from China

11. The present has been opened by me

12. Many books have been written by Thomas so far

13. Many accidents have been caused by Careless driving

14. Three buildings were damaged by the strong storm in this area

15. A lot of money have been stolen in the robbery

16. Millions of mobile phones have been sold by them in Asia this year 

Who :

- Làm chủ ngữ, đại diện ngôi người

- Thay thế cho danh từ chỉ người

….. N (person) + WHO + V + O

Câu bị động thì quá khứ đơn

S + was/ were + PII + (by O).

S+ was/ were + not + PII + (by O).

Was/ Were + S + PII + (by O) ?

Câu bị động thì hiện tại hoàn thành

S+ have/ has + been + PII + (by O)

S+ have/ has not + been + PII + (by O)

have/ has + S + been + PII + (by O)