Câu bị động ( Thì HTĐ `-` QKTD `-` TLG ) :

`-` Thì HTĐ : S + be + V3 / PII ( by O )

`-` Thì QKTD : S + was / were + being + V3 / PII ( by O )

`-` Thì TLG : S + is / am / are + going to be + V3 / PII ( by O )

`1`.The students are allowed to leave earlier by the teacher

`2`.The fire was being put out by the fireman when the building collapsed

`3`.A fundraiser is going to be organised for the homeless

`\text{@ TheFox}`

`1,` The students are permitted to leave earlier by the teacher.

- Bị động của "let": S + be + allowed/permitted + to + Vinf + O

`2,` The fire was being put out when the building collapsed

- Bị động thì quá khứ tiếp diễn: S + was/were + being + V3/ed + (O/by O)

`3,` A fundraiser is going to be organised for the homeless.

- Bị động thì tương lai gần: S + am/is/are + going to be + V3/ed + (O/by O)