1.saw/was waiting

2.has been/graduated

3.doesn't watch

4.met

5.stolen

6.will plant

7.was

8.am usually

9.has droven/knew

10.has worked

11.spoke

12.wags

13.did you do/rang

14.will leave/knows

15.come/are you

16.will come

17.will you 

18.bloom

19.have been living

20.have never forgotten/have just told

21.are preparing

22.has worked

23.was working

24.build/fly

25.have lived

26.lost

27.hasn't smoked

28.are bob and mary

29.have you received

30.did you study/forgot

31.has studied

32.writes

33.have played

34.left/haven't heard

35.did you speak/haven't seen/saw

36.is crying

37.was playing

38.saw/was waiting

39.has been 

40.has taught/graduated

41.doesn't watch

42.met

43.reported/captured

44.stole

45.has lived/broke

46.was

47.am usually

48.discoved

49.was raining

50.was doing