*Cấu trúc chung:

- Câu bị động thì quá khứ đơn (Câu $7$):

$(+)$ S + was/ were + V (P_II) + (by O).

$(-)$ S + was/ were + not + V (P_II) + (by O).

$(?)$ Was/ Were + S + V (P_II) + (by O)?

- Câu bị động thì hiện tại hoàn thành (Các câu còn lại):

$(+)$ S + have/ has + been + V (P_II) + (by O).

$(-)$ S + have/ has + not + been + V (P_II) + (by O).

$(?)$ Have/ Has + S + been + V (P_II) + (by O)?

$-------------$

$1.$ My bike has been stolen.

$2.$ The class meeting has been postponed.

$3.$ A new school has been built near our house.

$4.$ Has Lan been informed of the change?

$5.$ This room has been cleaned by my mother for two days.

$6.$ English has been taught for them by Miss Mary.

$7.$ That tree was planted by my father last month.

$8.$ The old road has been repaired in my neighborhood.

$9.$ The papers haven't been signed by Mrs. Andrew yet.

$10.$ The result has been known for a week.

1. My bike has been stolen (by someone).

2. The class meeting has been postponed (by them).

3. A new school near our house has been built (by them).

4. Has Lan been informed (by somebody) about the change?

5. This room has been cleaned (by my mother) for two days.

6. They have been taught English by Miss Lan.

7. That tree was planted by my father last month.

8. The old road in my neighborhood has been repaired.

9. The papers haven't been signed by Mrs. Andrew yet.

10. The result has been known for a week.

Dạng bài: Câu bị động (Passive voice)

Cách làm: Theo công thức: Subject+V+Object => Object (đóng vai trò làm chủ ngữ)+Tobe (chia theo thì) + Vpp +(by +S). Nếu Subject là someone, somebody, he, she, they thì có thể bỏ by.