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 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 buy 2 newspapers and 1 magazine everyday.

-> Two newspapers and one magazine are bought everyday.

9. My students will bring the children home.

-> The children will be brought home by my students.

1. Mary types letters in the office.

Letters are typed by Mary in the office (HTĐ)

2. His father will help you tomorrow.

You will be helped by his father tomorrow (TLĐ)

3 Science and technology have changed human life.

Human life has been completely changed by science and technology (HTHT)

4 Peter broke this bottle.

This bottle was broken by Peter (QKĐ)

5 They are learning English in the room.

English is being learnt in the room (HTTD)

6. Nothing can change my mind.

My mind can't be changed. (MV)

7. No one had told me about it.

I hadn't been told about it. (QKHT)

8. I buy 2 newspapers and 1 magazine everyday.

Her telephone number isn't known by me. ( HTĐ)

9. My students will bring the children home.

 The children home will be brought by my students. ( TLĐ)