Đáp án + Giải thích bước giải:

* Câu bị động:

- Thì HTHT: S + have/has + been + V2/ed + (by O) + ...

- Thì QKĐ: S + was/were + V2/ed + (by O) + ...

- Thì HTĐ: S + am/is/are + V2/ed + (by O) + ...

- Thì QKHT: S + had + been + V2/ed + (by O) + ...

1. Her breakfast was brought by her to school yesterday

2. Our room were cleaned 2 days ago   

3. His uncle was visited by Mr. Robin last month

4. The book is found by them on the floor

5. Her homework had been finished by her after school

6. Did a birthday cake was made by your mother for the party?

11. The plants were watered by them yesterday

12. Math lesson have been had on Monday

13. The vase of flowers were not broke by the cat yesterday

`1.` Her breakfast was brought by her to school yesterday

`3.` Our room were cleaned 2 days ago

`6.` His uncle was visited by Mr, robin last month

`7.` The book is found by them on the floor

`8.` Her homework had been finished by her after school

`9.` Did a birthday cake was made by your mother for the party?

`11.` The plants were watered by them yesterday

`12.` Math lesson have been had on Monday

`14.` The vase of flowers were not broke by the cat yesterday

____________________________

`-` ÁP dụng:

`+)` Câu bị động:

`->` Thì QKĐ: S + was/were + Vpp + (by O)

`->` Thì QKHT: S + had been + Vpp + (by O)

`->` Thì HTĐ: S + am/is/are + Vpp + (by O)

`->` Thì HTHT: S + have/has + been + Vpp + (by O)