23. 23/ They hadn’t built the bridge when we first came here

-> The bridge hadn't been built when we first came here.

24/ People don’t learn a foreign language in a short time

-> A foreign language isn't learnt in a short time

25/ Did anyone ask any questions about me ?

-> Did any questions be asked by anyone about me ?

26/ Henry wrote that book years ago, didn’t he ?

-> That book was written bt Henry years ago, didn’t it ?

27/ What sort of research are they doing in the laborotary ?

28/ You should place matches out of reach of children

-> Matches should be placed out of reach of children

29/ People say that inflation is getting out of control

-> It's said that inflation is getting out of control

30/ We’ll have finished all the work by the weekend

-> The work will have been finished by the weekend

31/ I heard her singing very beautifully

-> Her singing was heard to be very beautifully

32/ Scientists started discovering the universe thousands of years ago.

-> The universe was started discovering by scientists thousands of years ago.

34/ The robbers forced the bank manager to hand over the money.

-> The bank manager was forced to hand over the money by the robbers

35/ They let us go

-> We are let go

36/ The police stopped Tom on the highway and made him show his I.D card.

-> Tom was stopped on the highway by The police and made him show his I.D card.

37/ Write your address on the back of the cheque

-> Let your address be written on the back of the cheque

38/ Where did your child find the keys ?

-> Where did the keys be found by your child

39/ Some people think he is a dangerous criminal

-> He is thought to be a dangerous criminal

40/ They will have to sign these documents

-> These documents will have to be signed 

41/ The workers are going to pull down that old building

-> that old building is going to be pulled down by The workers 

42/ No one told me the truth

-> I wasn't told the truth

=>

23. The bridge hadn't been built when we first came here.

24. A foreign language isn't learned in a short time.

25. Were any questions about me asked?

26. That book was written years ago, wasn't it?

27. What sort of research is being done in the laboratory?

28. Matches should be placed out of reach of children.

29. It is said that inflation is getting out of control.

30. All the work will have been finished by the weekend.

31. She was heard singing very beautifully.

32. The universe started being discovered by scientists thousands of years ago.

34. The bank manager was forced to hand over the money by the robbers.

35. We were allowed to go by them.

36. Tom was stopped on the highway and he was made to show his I.D card by the police.

37. Let your address be written on the back of the cheque.

38. Where were the keys found by your child?

39. He is thought to be a dangerous criminal.

40. These documents will have to be signed.

41. That old building is going to be pulled down by the workers.

42. I wasn't told the truth.