Giải thích luôn ạ

38. Henry had been smoking for 10 years when he finally gave it up. 39. Yesterday morning I got up and looked out of the window. The sun was shining but the ground was very wet. It had rained. 40. We will have our examination next month. 41. Look at those black clouds! It is going to rain. 42. We will learn English this time next Monday. 43. We will finish this course before the final examination. 44. I have been reading "Chicken soup for the soul" but I haven't finished it yet. 45. Alan took a photograph of Sandra while she wasn't looking. 46. I have lost my key. Can you help me look for it? 47. Last night Tine was reading in bed when suddenly she heard a scream. 48. We are having a party next week. Would you like to come? 49. The Red River is flowing very fast today - much faster than yesterday. 50. While mother was cooking dinner, the phone rang. 51. Fish have existed on earth for ages and ages. 52. When boarding the plane, many passengers were annoyed because they had been waiting in the airport for three and a half hours. 53. If coastal erosion continues to take place at the present rate, in another fifty years this beach won't be existing anymore. 54. Their football team had never won a championship until last season. 55. By the end of this year, Tom will have studied English for three years. 56. In one year's time, I will have been working in this school for 15 years. 57. They will have finished this course by next June. 58. She will go abroad as soon as she has completed this English course. 59. The child had died before the doctor arrived. 60. We cleaned up the room as soon as the guests had left. 61. The secretary didn't finish the report by 10:00 yesterday. 62. Jane's eyes are red. She has been crying.