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.
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