1. The letters are typed in the office by Mary.

→ Thì HTD: S + is/ are/ am + PP + (by)

2. You will be helped by his father tomorrow.

→ Thì TLD: S + will be + PP + (by)

3. The human life has completely been changed with science and technology.

→ Thì HTHT: S + have/ has + been + PP + (by)

→ By + sb/ with + N

4. This bottle was broken by Peter.

→ Thì QKD: S + was/ were + PP + (by)

5. English is being learnt in the room.

→ Thì HTTD: S + is/ are/ am + being + PP + (by)

→ I/ we/ you/ they/ he/ she/ it/ people/ someone/ something/ ... thì ko cần by cx dk

6. My mind can't be changed.

→ Với Modal Vs: S + Modal Vs + be + PP + (by)

→ Nobody + V + O = S + V<phủ định> 

7. I hadn't been told about it.

→ Thì QKHT: S + had been + PP + (by)

8. Her telephone number isn't known.

→ Thì HTD

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

or Home will be brought to the children by my students.

→ Thì TLD

→ be brought sth/ to sb

10. I was sent a present last week.

or A present was sent to me last week.

→ Thì QKD

→ be sent sth/ to sb

11. We were given more information.

or More information was given to us.

→ Thì QKD

→ be given sth/ to sb

→ information ko đếm dk nên khi có more vẫn chia số ít

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

→ Thì QKTD: S + was/ were + being + PP + (by)

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

→ Với Modal Vs

14. Some of my books have been taken away.

→ Thì HTHT

15. The meeting will be held before May Day.

→ Thì TLD

Giải thích: Dựa theo: S + be + VpII + (by + O)

Chuyển các câu sau sang câu bị động

1. Mary types letters in the office.

=> Letters are typed by Mary in the office

2. His father will help you tomorrow.

=> You will be helped by his father tomorrow

3. Science and technology have completely changed human life.

=> Human life has completely been changed by 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

14. Somebody has taken some of my books away.

=> Some of my books have been taken away.

15. They will hold the meeting before May Day.

=> The meeting will be held before May Day.

( hay thì cho mình câu trả lời hay nhất, 5 sao và lời cảm ơn để mang về cho nhóm nhé ! Chúc bn học tốt!)