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1、虚拟语气的用法 动词的语气语气有三种:陈述语气,祈使语气和虚拟语气.语气表示说话人持有的态度或看法. 相关知识点精讲 1.虚拟语气在if 条件句中的用法 区分if 引导真实条件句和if引导的虚拟条件句的区别If he has time, he will go with us.= Probably he has time and will go with us.If he had time, he would go with us.=But in fact he has no time. 虚拟条件句中主句和从句的谓与动词构成形式如下表：if条件句中的谓与动词主句的谓与动词与现在的事实相反1. 行
2、为动词用did 形式2. be动词用wereshould / would /could might + 动词原形 与过去的事实相反had + doneshould / would /could might + have done与将来的事实相反1. 行为动词用did ;be动词用were2. should + 动词原形3. were to + 动词原形should / would /could might + 动词原形 混合时间的虚拟语气如果条件句中的动作和主句的动作不是同时发生，主句和从句的谓语动词的形式应分别根据各自所表示的时间加以调整。1) If I had received the p
3、assport yesterday, I would start today.2) If he had telephoned me last night, I would see him now.3) If he had followed the doctors advice, he would be all right now. if虚拟条件句中的到装如果虚拟语气的条件从句中含有were, had, should可将if省略，把were, had, should放在主语前面。Had you invited us, we would have come to your party.Were I
4、 you, I would do more practice after class.Should you meet him, you would greet him. (1) 动词wish后的宾语从句, 表示不能实现的愿望，表示“但愿.； 就好了；可惜悔不该； 与现在事实相反的愿望，从句的谓动词用过去式I wish that he werent so lazy. I wish I were ten years younger. 与过去事实相反的愿望：用wish表示对过去事情的遗憾。其句子结构为：had done或would, could, might have done。I wish tha
5、t I had gone to the football match last week.I wish that you had been here yesterday.表示将来的愿望时：从句动词would/could/might + 动词原形，常表达不满意，烦恼等。 I wish he would try again.He wishes that we would visit the old school.(2)虚拟语气用于as if/though 引起的方式状语从句和表语从句中，其中动词形式与wish宾语从句的形式相同。 They talked as if they had been fr
6、iends for years. She looks as if she would cry.(3)用来表示要求、建议、命令、提议等的主语从句、宾语从句和同位语从句中的虚拟形式：should + 动词原形，should可省略1) 用在表示建议、命令、要求、忠告等动词后，动词形式为(should) +动词原形. 常见动词：一个坚持insist，两个命令(order, command)，三个建议advise, suggest, propose，四个要求(demand , require, request, desire)。 注意：在suggest后的从句中 A.如果表示建议，用虚拟语气 B.如果表
7、示说明、暗示，用陈述语气The doctor suggested that I should take the medicine three times a day.The doctor suggested that my grandmother had caught a bad cold.在insist后的从句中 A.如果坚持做什么事情，用虚拟语气 B.如果坚持说明，坚持说/解释，用陈述语气 My sister insisted that she should organize the trip. He insisted that he was right.2用在“It is (was)+形
8、容词或过去分词/ 名词 + that结构中： 常用形容词有：natural, necessary ,important, strange, possible, surprising, amazing，desirable合意的，advisable明智的，crucial关键的，insistent坚持的，essential紧要的，根本的等 常用过去分词有: required ,demanded, suggested 建议, recommended 推荐, commanded命令的，desired想要，ordered命令，proposed提议，requested要求的等It is essential
9、that he should be prepared for this.It is requested that Mr. Li give a performance at the party.3)用于由表示建议、要求、命令请示等含义的名词引导的表语从句和同位语从句中，这类名词常见的有：advice, demand , desire, suggestion, proposal , request , order, requirement, recommendation ,motion提议，resolution决心，decision，idea，pity，preference，shame， surp
10、rise，wish，wonder等。(4) 用在would rather/sooner, had rather, would(just) as soon引导的宾语从句中,表示宁愿做什么或对过去做的事的懊悔。 1)表示与现在或将来事实相反用过去时2)表示与过去事实相反用had doneId rather you posted the letter right away.I would just as soon you had returned the book yesterday.注意假设某人愿自己做某事，would rather后用动词原形。 I would rather stay at ho
11、me today would ratherthan中用动词原形。 I would rather stay at home than go out today(5) It is (about/high)time + 过去式/should+动词原形 (should 不能省) It is high time that we put an end to discussion.(6) 在for fear that / in case that / lest以免，万一等引导的状语从句,动词用should+动原形，should 可以省略。 She put a blanket over the baby fo
12、r fear that he should catch cold.3. 含蓄虚拟条件句含蓄虚拟条件句是指句中没有明显的虚拟条件句，而是利用其他手段来暗示存在虚拟条件，这类隐含式虚拟条件句往往可以转化成if引导的条件句。常用来表示含蓄虚拟条件的手段有：(1)介词或介词短语，如：but for, but that, without等 But for the leadership of the Party, we could not be living happily today.= If there were not the leadership of the party, we could no
13、t be living happily today. Without music, the world would be a dull place.(2)通过上下文及内在含义，句中往往有but, otherwise等类似转折词。 He worked very hard, otherwise he would have failed.(3)分词短语 Born ten days earlier, the boy could have seen his father.(4)情态动词完成时暗示虚拟语气。should/ could / might/ ought to + have done 表示“过去本
14、应该可以做而实际上却没做shouldnt have done表示“过去不应该做而实际上做了neednt have done 表示“过去没必要做而实际上做了.Drilling1. If it _ rain, we _ get wet. A. is to, should B. were to, would C. were going to, would D. was going to, should 2. But for the party, he _ of hunger 30 years ago. A. would have died B. would die C. must have died
15、 D. must die 3. _ today, he would got there for holiday. A. Was he leaving B. Were he to leave C. Would he leave D. If he leaves 4. Its high time that we _ to school. A. would to B. went C. go D. will go 5. Id rather you _ right away. A. leave B. left C. will leave D. to leave 6. He is working hard
16、for fear that he _. A. fails B. failed C. would fail D. fail 7. It is really strange that the girl _ so early. A. has been married B. has married C. be married D. would marry 8. The teacher agreed to the suggestion that the students _ two weeks to prepare for the exam. A. give B. should give C. be g
17、iven D. would be given 9. He insisted that he _ me before. A. see B. should see C. had seen D. saw 10. The two strangers talked as if they _ friends for years. A. were B. would be C. have been D. had been 11. He wishes _ mistakes. A. he doesnt always make B. he isnt always making C. he didnt always
18、make D. he wouldnt always making 12. Without your help, our team _ the last match. A. wont win B. will lose C. wouldnt have won D. cant win 13. It is important that I _ with Mr. Willians immediately. A. speak B. spoke C. will speak D. to speak 14. The doctor suggested that she _. A. will not smoke B
19、. not smoke C. would not smoke D. did not smoke 15. If I _ you, I wouldnt return the call. A. be B. am C. was D. were 16. It is imperative that you _ on time. A. are B. will be C. be D. would be 17. You are late. If you _ a few minutes earlier, you _ him. A. came/ would meet B. had come/ would have
20、met C. come/ will meet D. had come/ would met 18. I cant stand him. He always talks as though he _ everything. A. knew B. knows C. has known D. had known 19. You look so tired tonight. It is time you _. A. go to sleep B. went to sleep C. go to bed D. went to bed 20. I recommended that the student _
21、his composition as soon as possible. A. finishing writing B. should finish the writing C. finish writing D. finished writing 21. The Law requires that everyone _ his car checked at least once a year. A. has B. had C. have D. will have 22. But for the leadership of our Party, we _. A. shouldnt succee
22、d B.could not have succeed C. will not succeed D. should not have succeeded . 稳固练习1. If there were no subjunctive mood, English _ much easier.A. will be B. would have been C. could have been D. would be2. If I _ you, Id join the army.A. amB. wasC. wereD. would be3. If he _ tomorrow, he would find Mr
23、 Wang in the office.A. comesB. will comeC. should comeD. come4. If it _ next week , the crops would be saved.A. rainsB. will rainsC. would rainD. should rain5. If I _ it, I would do it in a different way.A. were to doB. doC. had doneD. was to do6. Supposing the weather _ bad, where would you go ?A.
24、isB. will beC. wereD. be7. If he had worked harder, he _.A. would succeedB. had succeeded C. should succeedD. would have succeeded8. If he _, he _ that food.A. was warned; would not take B. had been warned; would not have takenC. would be warned; had not taken D. would have been warned; had not take
25、n9. If my lawyer _ here last Saturday, he _ me from going.A. had been; would have prevented B. had been; would preventC. were; would prevent D. were; would have prevented10. If he _ it, he _ it.A. had seen; could have believedB. saw; couldnt believeC. saw; couldnt have believedD. has seen; had belie
26、ved11. Do you think the thief entered through the window?No, if he had, I dont believe, _ broken the living-rooms window.A. he would have B. he must have C. he hadD. should he have12. Did you go swimming last Sunday? No. We would have gone _ nicer.A. if the weather was B. would the weather have been
27、C. had the weather been D. should the weather be13. _ it _ for your help, I couldnt have made any progress.A. Had; not beenB. Should; not been C. Did; not been D. Not; been14. _ today, he would get there by Friday.A. Would have left B. Was he leaving C. Were he to leaveD. If he leaves15. It is ordered that a new bridge _ over the wide river.A. should be builtB. would built C. will be builtD. built