27. haven't been living
28. have never forgotten /have just told
29. are preparing
30. stayed /rode
31. told/had visited
32. has worked
33. worked
34. build/fly
35. have lost/Can
36. hasn't smoked
37. arrived/has just gone
38. have ..been
39. Have .. received
40. joined /was
41. Have .. remembered / forgotten
42. had studied
43. wrote
44. left / haven't heard
45. Did .. speak / haven't seen / couldn't remember / saw
46. was playing
47. discovered
48. will have finised
49. will have been living
50. did/ die / don't know / die
