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48. Will have finished

49. Will have lived

50. When did your father die? _ I do not know when he died

27. haven't lived

28. never forget - have just told

29. are preparing

30. stayed - rode - had borrowed

31. told- had visited

32. has worked

33. worked

34. build - fly

35. lost - Can

36. haven't smoked

37. arrived - have just gone

38. have Bob and Mary been

39. Have you receive 

40. joined - was

41. Do you remember - have you forgotten

42. has studied

43. wrote

44. left - haven't heard

45. Did you spoke - haven't seen - could't - saw

46. were playing

47. discovered

48. would have finished 

49. would have lived

50. did your father die - didn't remember - died