Ex2:

25.If we had enough rain, we could have grown.

26. if Ann had known how difficult the job was, she wouldn't have taken it.

27.If they invited me, i could go to the party.

28. If it weren't so crowded, i could ride the bus to work every morning.

29.If you had listened to me, you wouldn't have got into so much trouble.

30.If you didn't give me all your money, i would kill you.

31.If you leave the milk out of the fridge, it'll go off. 

32.Unless you explained the situation to the teacher, she wouldn't understand you.

33. It was not until her mother came home that the child went to sleep.

34.It was not until we began primary school that we studied English.

35.It was not until the last visitor left that the little girl opened the gifts.

36.It was not until they had some proof that the police made any accusations.

37.It was not until the football match ended that everybody left the stadium .

38.The cake is being cut with a sharp knife by Mary.

39.a lot of money was given to me last Sunday by John.

40. Have the Christmas cards been sent to your family?

41. The note wasn't be taken to the manager by the secretary.

42.The meeting will be held before May Day by them.