`5.` The English grammar has been explained by the teacher.

`->` Bị động hiện tại hoàn thành: S + has/have + been + V3/ed + by O

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

`->`  Bị động quá khứ: S + was/were + V3/ed + by + O

`7.` His parents will be visited by Tom next month.

`->`  Bị động modal verbs: S + modal verbs + be + V3/ed + by + O

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

`9.` Was beautiful dress done by Mary?

`->` Bị động quá khứ: Was/Were+ S + V3/ed + by + O? (nghi vấn)

`10.` These old picture won't be hung in the living room.

`11.` This factory wasn't built by the German during the Second World War.

`12.` This house and these cars are going to be painted for Christmas Day.

`->` Bị động với "going to be": S + is/am/are + going to be + V3/ed + by + O

`13.` The cats had been fed by Ann before she went to the cinema.

`->`  Bị động quá khứ hoàn thành: S + had + been + V3/ed + by O

`14.` The pollution problems have been discussed by the students since last week.