31. Tom wishes he had watched the football match last night.

32. Yesterday we did the difficult test, so we couldm't finish it in two hours.

33. The man asked me how many students there were in my class.

34. The teacher advised us to go to the lecture

35. Unless we hurry, we'll miss the train.

36. The door of the house couldn't be opened

37.  The city in which we were born is very small.

38. She began syudying French since five years ago.

39. They didn't want anybody to see them so that they left very early in the morning.

40. He is fond of collecting old coins.

=>

31. Tom wishes he hadn't watched the football match last night.

32. Yesterday we did such a difficult test that we couldn't finish it in 2 hours.

33. The man asked me how many students there were in my class.

34. The teacher advised us to go to the lecture.

35. Unless we hurry, we'll miss the train.

36. The door of the house couldn't be opened. 

37. The city in which we were born is very small.

38. She began studying/ to study French 5 years ago.

39. They didn't want anybody to see them so that they left very early in the morning.

40. He is fond of collecting old coins.