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
