`1. `Mary types letters in the office.

`=>` Letters are typed in the office by Mary.

`2. `His father will help you tomorrow.

`=> `You’ll be helped by his father tomorrow.

`3.` Science and technology have completely changed human life.

`=>` The human life has completely been changed with science and technology.

`4.` Peter broke this bottle.

`=> `This bottle was broken by Peter.

`5`. They are learning English in the room.

`=> `English is being learnt in the room.

`6.` Nothing can change my mind.

`=>` My mind can’t be changed.

`7.` No one had told me about it.

`=>` I hadn’t been told about it.

`8. `I don’t know her telephone number

`=>` Her telephone number isn’t known.

`9.` My students will bring the children home.

`=>` The children will be brought home by my students.

`10.` They sent me a present last week.

`=>` I was sent a present last week.

`11. `She gave us more information.

`=>`We were given more information.

`12. `The chief engineer was instructing all the workers of the plan.

`=> `All the workers of the plan were being instructed by the chief engineer.

`13. `They can’t make tea with cold water.

`=>` Tea can’t be made with cold water.

QKĐ:S+V(ed/Ps)+O...

`->`S+was/were+V(3/ed)...(by+O)

HTĐ:S+V(s/es)+O...

`->`S+am/is/are+V(3/ed)...(by+O)

HTHT:S + have/has + P2 + O...

`->`S + have/has + been + V(3/ed)...(by+O)

`@#ShuKurenai`

`1,` Letters are typed by Mary in the office.

`2,` You will be helped by his father tomorrow.

`3,` Human life has been completely changed by science and technology.

`4,` This bottle was broken by Peter.

`5,` English is being learned by them in the room.

`6,` My mind cannot be changed.

`7,` I hadn't been told about it. 

`8,` Her telephone number is not known.

`9,` The children will be brought home by my students.

`10,` A present was sent to me last week.

`11,` More information was given to us.

`12,` All the workers of the plan were being instructed by the chief engineer.

`13,` Tea can't be made with cold water.

`-----`

`-` Câu bị động HTĐ: S `+` am/is/are `+` V3/V-ed...(by  x`+` O)

`-` Câu bị động của TLĐ: S `+` will `+` be `+` V3/V-ed..(by `+` O)

`-` Câu bị động HTHT: S `+` have/has `+` been `+` V3/V-ed..(by `+` O)

`-` Câu bị động qkđ: S `+` was/were `+` V-ed/V3…(by `+` O)

`-` Câu bị động HTTD: S `+` am/is/are `+` being `+` V3/V-ed… (by `+` O)

`-` Câu bị động của đtkt: S `+` đtkt(must/can/..) `+` be `+` V3/V-ed…(by `+` O)

`-` Câu bị động qkht: S `+` had `+` been `+` V3/V-ed… (by `+` O) 

${\text{Lưu ý: }}$

`+` Các đại từ bất định như somebody, nobody, people,..  không dùng by + O