`1.` The witness is being interviewed by the lawyer.

`-` Câu bị động thì HTTD: S + am/is/are + being + VpII + (by + O) + time.

`2.` Soccer was played by Nam and his classmates yesterday afternoon.

`-` Câu bị động thì QKD: S + was/were + VpII + (by + O) + time.

`3.` We are often given gifts by my father. 

`-` Câu bị động thì HTD: S + am/is/are + VpII + (by + O) + time.

`-` Trạng từ chỉ tần suất (always, often, usually,...) đứng sau tobe 

`4.` A big cake is being bought for me on my birthday. 

`-` Câu bị động thì HTTD 

`-` Với các chủ ngữ câu chủ động là đại từ nhân xưng (I, you, we, they, he, she, it) thì chuyển sang câu bị động có thể ko dùng (by + O) 

1. The witness is being interviewed by the lawyer.

2. Soccer was played by Nam and his classmates yesterday afternoon.

3. We are often given gifts by my father.

4. A big cake is being bought for me on my birthday.

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PASSIVE VOICE:

 - Past tense: S + was/were + V-pp + by...

 - Present simple: S + is/am/are + V-pp + by...

 - Present continuous: S + is/am/are + being V-pp + by...