`81,` Before the exams were taken, their lessons had been revised.

`+` Bị động thì quá khứ đơn: S + was/were + Vpp + (O/by O)

`+` Bị động thì quá khứ hoàn thành: S + had + been + Vpp + (O/by O)

`82,` When he came home, a newspaper was being read by his father.

`+` Bị động thì quá khứ tiếp diễn: S + was/were + being + Vpp + (O/by O)

`83,` I will be taken to Ho Chi Minh City by my father next week.

`+` Bị động thì tương lai đơn: S + will + be + Vpp + (O/by O)

`+` Tân ngữ (O) chỉ thời gian (next week) đứng sau by O

`84,` When I was 18 years old, I was allowed to go out in the evening.

`+` Bị động với allow: S + allow/allows/allowed/... + O (người/vật) + to-inf + (O)

`→` O (người/vật) + be + allowed + to-inf + (O/by O)

`85,` Your new hat were being worn when you was met by me yesterday.

`+` Bị động thì quá khứ tiếp diễn: S + was/were + being + Vpp + (O/by O)

`+` Bị động thì quá khứ đơn: S + was/were + Vpp + (O/by O)

`+` Tân ngữ (O) chỉ thời gian (yesterday) đứng sau by O

81 Before the exams were taken, their lessons had been revised.

82 When he came home, a newspaper was being read by his father.

83 I will be taken to Ho Chi Minh City by my father next week.

84 When I was 18 years old, I was allowed to go out in the evening.

85 Your new hat were being worn when you was met by me yesterday.