31. It might have been a ghost, .......................?
32. It couldn't have been done by animals, .......................?
33. It's a pity that Seila didn't know about it, .......................?
34. You have heard about that, .......................?
35. Nam did the work well, .......................?
36. He didn't have to speak to me, .......................?
37. He won't fall down, .......................?
38. You wouldn't like the windown open, .......................?
39. He uesd to beat his wife, .......................?
40. She came very late, .......................?
41. Come and see me tomorrow, .......................?
42. I'd better go, .......................?
43. There's an examination tomomorrow, .......................?
44. You can't play tennis today, .......................?
45. She's been studying English for 2 years, .......................?
46. Your brother doesnt's like watching TV, .......................?
47. Let's listen to the radio, .......................?
48. Mary is reading a book in her room, .......................?
49. His parents won't buy him a new game, .......................?
50. You've just used the computer, .......................?
51. Turn off the television, .......................?
52. I'm late for the party, .......................?
53. They never go to the theatre, .......................?
54. His mother is very proud ò him, .......................?
55. The lift isn't working today, .......................?
56. Nothing could be done, .......................?
57. Everybody is here, .......................?
58. He didn't wake up this morning, .......................?
59. Baired didn't produce the first TV picture before 1920, .......................?
60. There are many interesting programs tonight, .......................?
Mình nghĩ là " might have been + V_ing " thì chỉ là dự đoán , chưa khẳng định , chưa chắc chắn . " Must have been + V_ing " thì khẳng định chắc chắn
thanks bạn nhiều