- BĐ :

+ HTĐ : S + is / am / are + VpII ( by O )

+ QKĐ : S + was / were + VpII ( by O )

+ HTTD : S + is / am / are + being + VpII ( by O )

+ HTHT : S + haven't / hasn't + been + VpII ( by O )

1.We were asked many difficult questions

2.I was advised to reuse milk bottles

3.These rooms are cleaned by my sister every day

4.A lot of pollution has been caused by waste

5.When is his homework usually done ?

6.This tree was planted by my father

7.The rubbish hasn't been collected 

8.Is recycled paper being used ?

9.We were made to work hard everyday

-> be made + to do sth ( 9 , 12 )

=> Bị ép làm gì

10.Her doll was bought by her mother last week

11.The article has been typed by Jack recently

12.The students are made to do a lot of homework by teacher

\text{# TF}

1. They asked us a lot of difficult questions.

2. She recommended that I reuse milk bottles.

3. These rooms are cleaned by my sister every day.

4. Pollution has been caused by waste.

5. What is his usual time for doing homework?

6. This tree was planted by my father.

7. The rubbish hasn't been collected by him.

8. Is recycled paper being used by people?

9. We were made to work hard every day by them.

10. A doll was bought for her by her mother last week.

11. The article has been recently typed by Jack.

12. The students are made to do a lot of homework by the teacher.

Công thức của câu bị động : 

Chủ ngữ + động từ "to be" (ở thì tương ứng) + quá khứ phân từ (Past Participle) + bởi + tác nhân (nếu cần)

Các thì của động từ "to be" sẽ thay đổi tùy theo thì của câu gốc. Dưới đây là các thì của động từ "to be":

Hiện tại đơn: am/is/are

Quá khứ đơn: was/were

Hiện tại hoàn thành: has/have been

Quá khứ hoàn thành: had been

Tương lai đơn: will be

Tương lai hoàn thành: will have been

@Thaonguyen0309