30. People say that early Egyptian and Greek sailors used carrier-pigeons.

`=>` It is said that early Egyptian and Greek sailors used carrier-pigeons. ( HTĐ )

31. People saw him steal your suicase.

`=>` He was seen to  steal your suicase. ( QKĐ )

32. Mr. Adam used to drink a lot of wine.

`=>` A lot of wine used to be drunk by Mr. Adam. ( QKĐ )

33. She was cooking dinner when we dropped in to see her.

`=>` Dinner was being cooker by her when we dropped in to see her. ( QKTD )

34. He phoned me after he had finished the oral test.

`=>` I was phoned by him after he had finished the oral test. ( QKĐ )

35. They will have used a lot of robots in factories by 2020.

`=>` A lot of robots will have been used in factories by 2020. ( TLHT )

36. Did people make jeans two hundred years ago?

`=>` Were jeans made two hundred years ago? ( QKĐ )

37. I had a boy polish my shoes every Monday.

`=>` My shoes were polished by a boy every Monday.

38. Clear up the house at once.

`=>` Let the house be cleared up at once.

*) Cấu trúc bị động của câu mệnh lệnh: Let + object + be + PII

39. We are going to open the new restaurant tomorrow.

`=>` The new restaurant is going to be opened tomorrow. ( tương lai gần )

40. They are going to have a mechanic repair their car.

`=>` Their car is going to be repaired by a mechanic. ( tương lai gần )

41. When will they pull this old building down?

`=>` When will this old building down be pulled down ? ( TLĐ )

35. A lot of robots will have been used in factories by 2020. 

36.  Were jeans made two hundred years ago? 

37.My shoes were polished by a boy every Monday.

38.  Let the house be cleared up at once.

39.  The new restaurant is going to be opened tomorrow. 

40. Their car is going to be repaired by a mechanic. 

41.  When will this old building down be pulled down ?