$5.$ The English grammar has been explained by our teacher.

- Câu bị động thì hiện tại hoàn thành: S + have/ has + been + V (P_II) + (by O).

$6.$ The accident in this city was caused by some drunk drivers.

- Câu bị động thì quá khứ đơn: S + was/ were + (not) + V (P_II) + (by O).

$7.$ Tom's parents will be visited by him next month.

- Câu bị động thì tương lai đơn: S + will + be + V (P_II) + (by O).

$8.$ The secretary wasn't phoned by the manager this morning.

- Câu bị động thì quá khứ đơn: S + was/ were + (not) + V (P_II) + (by O).

$9.$ Was this beautiful dress bought by Mary?

- Câu bị động thì quá khứ đơn: Was/ Were + S + (not) + V (P_II) + (by O)?

$10.$ These old pictures will not be hung by me in the living room.

- Câu bị động thì tương lai đơn: S + will + not + be + V (P_II) + (by O).

5. the English grammar have been explained by our teachers

6. the accident was caused by some drunk drivers in this city

7. his parents will be visited by Tom next month

8. the secretary wasn't phoned by the manager this morning

9. Did this beautiful dress was bought buy Mary?