=>

1. My briefcase has been taken.

-> bị động HTHT Have/has been V3/ed

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

-> bị động QKĐ was/were V3/ed

3. Her report had been finished by soon.

-> bị động QKHT had been V3/ed

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

-> bị động QKĐ was/were V3/ed

5. Five suspects have been arrested by the police.

-> bị động HTHT have/has been V3/ed

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

-> bị động QKĐ was/were V3/ed

7. The house was struck by lightening.

-> bị động QKĐ was/were V3/ed

8. A group of students' friends have been met at the rail way station.

-> bị động HTHT

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

-> bị động QKĐ

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

-> bị động TLĐ will (Not) be V3/ed

11. Tom has been operated by Marry since 10 o'clock.

-> bị động HTHT