`1.` My briefcase has been taken.

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

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

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

`3.` The meeting will be held before the May Day.

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

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

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

`5.` Five suspects have been arrested by the police.

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

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

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

`7.` All the workers of the plan were being instructed by the chief engineer.

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

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

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

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

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

`10.` Exercise won't be corrected by the teacher tomorrow.

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