=>

1. The window was broken by the boys while they were playing football yesterday.

-> bị động QKĐ was/were V3/ed

2. We were brought a big cake by the waiter.

-> bị động QKĐ was/were V3/ed

3. New houses have been built by the workers for five months.

-> bị động HTHT have/has been V3/ed

4. Houses were burnt quickly by the fire.

-> bị động QKĐ was/were V3/ed 

5. Vegetables aren't bought at this market by my mother.

-> bị động HTĐ is/am/are (not) V3/ed

6. Thieves were caught by the police last night.

-> bị động QKĐ was/were V3/ed

7. Flowers in the garden are cut by my grandmother every day.

-> bị động HTĐ is/am/are V3/ed

8. Your homework must be done carefully.

-> bị động must be V3/ed

9. Water should be drunk every day.

-> bị động should be V3/ed

10. I wasn't driven to school by my father last week.

-> bị động QKĐ was/were (not) V3/ed

11. Much meat was eaten by us last night.

-> bị động QKĐ was/were V3/ed

12. The chickens will be fed tomorrow.

-> bị động TLĐ will be V3/ed