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1、 语法专题四：时态1. 现在时(Present tenses)时态结构与用法一般现在时结构：do/does/be(am/is/are)用法：1. 表示现在的习惯动作、状态。 2. 表示客观规律、真理；特征、性格等。 3. 用于标题，小说、剧本、图片等中的情节介绍。 4. 用于时间、条件、让步状从中，表将来。 5. 表示按计划、规定的时间发生的动作，如时刻表等。现在进行时结构：be(am/is/are) doing; 或 be + adv. / prep. (如：in, on, under等)用法：1. 表示现在、现阶段正在发生、进行的动作。 2. 常与go, leave, come, arri
2、ve, stay, move等连用，表示将来的动作。 3. 与always, forever等连用，表示动作的反复，含厌倦或赞赏的意思。注意：1. 表示感觉、心理、结果性的动词一般不用于进行时。 2. 常见表进行的副词、介短：in progress in operation on show现在完成时结构：have/has done用法：1. 过去发生且结束，但对现在造成影响。2. 过去发生且持续到现在。3. 在以下两个句型中，其从句要求用现在完成时： It (This) is the first (last, second, third,) time that It (This) is the
3、 best (worst, most interesting,) + n. + that完成进行时结构：have/has been doing用法：过去发生，目前还在进行，且可能持续下去，强调动作的延续性。巩固练习：1. Ive won a holiday for two days to Florida. I my mum.A. am taking B. have taken C. take D. will have taken2. Because farmland _quickly, the government is considering solving the problem. A.
4、is being lost B. is lost C. is losing D. loses3. John and I _ friends for 8 years. We first got to know each other at a party. But we_ each other a couple of times before that. A. had been; have been B. have been; have been C. had been; had seen D. have been; had seen4. Dad will come to see me when
5、I _ the training course. A. will have finished B. will finish C. are finishing D. finish5. -Did he notice you enter the room? -I dont think so. He _ to the radio with his eyes shut. A. listened B. was listening C. has listened D. had listened6. We _ our new neighbors yet, so we dont know their names
6、. A. dont meet B. wont meet C. havent met D. hadnt met7. I have to go to work by taxi because my car _ at the garage. A. will be repaired B. is repaired C. is being repaired D. be repaired8. -_ leave at the end of the month. -I dont think you should do that until _ another job. A. Im going to; youd
7、found B. Im going to; youve found C. Ill; youll find D. Ill; youd find9. I wont tell the student the answer to the math problem until he _ on it for an hour. A. has been working B. will have worked C. will have been working D. had worked10. The father as well as his three children _ skating on the f
8、rozen river every Sunday afternoon in winter. A. is going B. go C. goes D. are going11. I _ in London for many years, but Ive never regretted my final decision to move back to China. A. lived B. was living C. have lived D. had lived12. This machine _. It hasnt worked for years. A. didnt work B. wasn
9、t working C. doesnt work D. isnt working13. My friend, who _ on the IOC all his life, is retiring next month. A. served B. is serving C. had served D. has served14. Look at the timetable. Hurry up! Flight 4026_ off at 18:20. A. takes B. took C. will be taken D. has taken15. -I dont suppose the polic
10、e know who did it. -Well, surprisingly they do. A man has been arrested and _ now. A. has been questioned B. is being questioned C. is questioning D. has questioned 16. So far it is the best crosstalk I _. A. heard B. have heard C. will hear D. had heard17. -I will come to attend your lecture at 10:
11、00 tomorrow. -Im sorry, but by then my lecture will have ended and I _ my guests in my office. A. is being met B. will meet C. will be meeting D. will have met18. -Hi, Tracy, you look tired. -I am tired. I _ the living room all day. A. painted B. had painted C. have been painting D. have painted19.
12、With the development of science, more new technology _ to the field of IT.A. has introduced B. is being introduced C. is introduced D. was introduced20. The two friends _ on line for three hours, and they will go on. A. had been chatting B. had chatted C. were chatting D. have been chatting21. -Lets
13、 see if the baseball game has started yet. -Started? It must be clear who _ by now. A. is winning B. wins C. has won D. would win22. -Whats the matter, Jane? You look sad. -Oh, nothing much. As a matter of fact, I _ of my friends back home. A. was just thinking B. just thought C. have just been thinking D. have just thought23. He will have learned English for 8 years by the time he _ from university. A. will graduate B. will have graduated C. graduates D. is to graduate24. There was a knock at the door. It was the second time that someone _
