25. Trees had been planted

-> Bị động thì QKHT : S + had + been + V3/ed

26. The papers will be received tomorrow

-> Bị động thì TLĐ : S + will + be + V3/ed

27. Natural resources must be coserved

-> Bị động DTĐB : S + DTĐB + be + V3/ed

28. Tea can not be made with cold water

-> Bị động DTĐB : S + DTĐB + be + V3/ed

29. Engine of the car must be repaired

-> Bị động DTĐB : S + DTĐB + be + V3/ed

30. Pandas should be saved from extinction

-> Bị động DTĐB : S + DTĐB + be + V3/ed

1. He is thought to drive dangerously

It is thought that he drives dangerously

2. It is said that he was a teacher.

He is said to be a teacher

3. 13 is believed to be an unluckly number

It is believed that 13 is an unlucky number.

Cấu trúc : S1 + (tobe) + said/ thought/ believed/.... + to Vinf… (Khi V1 cùng thì với tobe)

Is/ am/ are/ was/ were -> to be