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

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

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

`4,` This bottle was broken by Peter.

`5,` English is being learned 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 by me.

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

`10,` I was sent a present last week.

`11,` More information was given to us by her.

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

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

`14,` Some of my books has been taken away.

`15,` The meeting will be held before May Day.

`text{Part 2 :}`

1. Letters are typed in the office by Mary.

2. You will be helped by his father tomorrow.

3. The human life has completely been changed with 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. More information was given us.

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

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

14. Some of my books has been taken.

15. The meeting will be held before May Day.