`1` My briefcase has been taken 

`-` Bị động thì HTHT : S + has/have + been + Vpp + ( by O ) 

`2` Our written work was returned to us by the teacher

`-` Bị động thì Quá Khứ Đơn : S + was/were + Vpp + ( by O ) 

`3` Her report has been finished by soon 

`-` Bị động thì HTHT : S + has/have + been + Vpp + ( by O ) 

`4` The little boy was bitten by the mad dog

`-` Bị động thì Quá Khứ Đơn : S + was/were + Vpp + ( by O ) 

`5` Five suspects have been arrested by the police

`-` Bị động thì HTHT : S + has/have + been + Vpp + ( by O ) 

`6` He was ordered to take a long rest by the doctor

`-` Bị động thì Quá Khứ Đơn : S + was/were + Vpp + ( by O ) 

`7` The house was struck by lighting

`-` Bị động thì Quá Khứ Đơn : S + was/were + Vpp + ( by O ) 

`8` Their friends have been met by a group of students at the railway station 

`-` Bị động thì HTHT : S + has/have + been + Vpp + ( by O ) 

`9` Tom wasn't allowed to take these books home

`-` Bị động thì Quá Khứ Đơn : S + was/were + not + Vpp + ( by O ) 

`10` Exercises won't be corrected by the teacher tomorrow

`-` Bị động thì Tương Lai Đơn : S + will + not + be + Vpp + ( by O ) 

`+` Note : Nếu chủ ngữ không xác định rõ ràng , cụ thể thì khi chuyển sang câu bị động không cần dùng by O