1. Letters are typed in the office by Mary.

2. You will be helped by his father tomorrow.

3. This bottle was broken by Peter.

4. English is being learned/learnt in the room.

5. The children will be brought home by my children.

6. We were given more information.

   More information was given to us.

7. The engine of the car has to be repaired.

8. A lot of money is spent on advertising everyday.

9. A cake is being cut with a sharp knife by Mary.

10. A teacher is going to be told (by teacher).

*Cấu trúc: 

S+V+O+(trạng từ chỉ nơi chốn)+(trạng từ chỉ tgian)

=> S(O)+be+P2+(trạng từ nơi chốn)+by+O(S)+(trạng từ tgian)

*Notes: 

- Tân ngữ của câu chủ động là people/they/someone/somebody/we/... thì chuyển sang bị động có thể bỏ đi.

- Adv tần suất "always/ often/..." đặt sau "tobe" và trước V.

- Adv tần suất "everyday/once a week/..." đặt trước "by+O"