`-` BĐ :

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

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

`15`.The money was returned by John last night

`16`.The room was filled by smoke

`17`.That book was taken from the desk by Bob

`18`.A dancing class was started last week

`19`.The accident was seen by Mr.Smith

`20`.Our written work was returned to us by the teacher

`21`.For the time being , that group is being taught by Alice

`\text{# TF}`

`15`. The money was returned by John last night.

`16`. The room was filled of smoke.

- be filled of : bị lấp đầy bởi

`17`. That book was taken from the desk.

- take - took - taken: lấy

`18`. A dancing class was started last week.

`19`. The accident was seen by Mr. Smiths.

- see - saw - seen : nhìn thấy

`20`. Our written work was returned to us by the teacher.

`21`. For the time being, that group is being taught by Alice.

- Bị động Hiện tại tiếp diễn $(+)$ S + am/is/are + being + Vpp + (by O)

- teach - taught - taught : dạy

`------------`

* Bị động Quá khứ đơn:

$(+)$ S + was/ were + Vpp + (by O)

- Chủ thể của hoạt động là ĐTNX, ĐTBĐ hoặc chung chung, không rõ thì không cần thêm by O.

- by O đứng trước trạng từ chỉ thời gian, sau trạng từ chỉ nơi chốn.