@Gấu 

Câu 1

⇒ Letters are typed in the office by Mary

Câu 2: 

⇒ You will be helped by his father tomorrow

Câu 3: 

⇒  Human life has been completely changed by science and technology

Câu 4:

⇒ This bottle was broken by Peter

Câu 5:

⇒ English is being learnt by them in the room

Câu 6: 

⇒  My mind can't be changed

Câu 7: 

⇒ I hadn't been told about it

Câu 8:

⇒Her telephone number isn't known

Câu 9:

⇒ The children will be brought home by my students

Câu 10:

⇒ I was sent a present last week

Câu 11:

⇒We were given more information

Câu 12:

⇒All the workers of the plan was being instructed by the chief engineer

Câu 13:

⇒Tea can't be made with cold water

Câu 14:

⇒Some of my books have been taken by somebody away

Câu 15:

⇒The meeting will be held by them before May Day

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1. Letters are typed in the office by Mary.

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 learnt in the room.

6. My mind can't be changed.

7. I hadn't been told about it.

8. Her telephone number isn't known.

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

10. I was sent a present last week.

11. We were given more information.

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

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

14. Some of my books have been taken away.

15. The meeting will be held before May Day.