虚拟语气有些条件句是可能实现的，称为真实条件句. 虚拟语气是动词的一种特殊形式，用来表达说话人的意愿.请求，设想，等未能或不可能实现的事实，或说话人看来实现可能性很小的情况.做这类题时首先要弄清楚虚拟语气的各种句型，即由if引导的虚拟条件句，省略if的倒装形式，可跟虚拟语气的宾语从句，同位语从句，表语从句的句型，以及表示祝愿或感叹的句子和由without， but for等介词引导的短语或句子.主要用法1). 主语从句，同位语从句中虚拟语气的用法.2). 宾语从句中虚拟语气的用法，尤其是wish 虚拟语气结构的用法.3). If条件句中虚拟语气的用法，应特别注意省略if的倒装结构是考试的重点.4). would rather（=wish）等结构中虚拟语气的用法.5). if only（如果。

就好了）结构中虚拟语气的用法.6). But， or， otherwise 等含蓄条件句的用法.7). It’s time (that)（早该。

）等结构中虚拟语气的用法.1. 虚拟语气在虚拟条件句中的运用(1) 虚拟语气现在时，用以表示与现在/将来事实相反的假设或现在实现可能性不大的情况.Eg. If I were a bird， I would fly to you.If it is not for their help， we shall be in a very difficult position.If it were not for their help， we should be in a very difficult position.If I had seen the film, I would…..(2) 虚拟语气过去式. 表示与过去事实完全相反的假设.Eg. If we had started earlier， we should not have missed the train.If she hadn’t been ill， she might have come.If she were not ill， she might come.◆书面语中，如果从句里含有should， had， were或其他助动词，则可将从属连词if省去，将助动词.情态动词.be或have放在句首形成部分倒装.Eg.Were he in your position，he’d do the same.If he Were in your position，he’d do the same.Had I had time， I would have done that yesterday.If I Had had time， I would have done that yesterday.If he Should (万一)come tomorrow， I should give him the dictionary.(3) 虚拟语气在某些从句中的应用.A)在(表现了说话人的愿望)wish， suggest， order， demand， propose，command， request， recommend， require， decide， insist， desire，urge等动词的宾语从句(should:应该) + 动词原形.以及would rather /sooner that后要用“ (should:应该) + 动词原形” 来表示愿望，建议，命令，要求等;由上述动词派生或转化的名词suggestion， proposal， plan，motion， recommendation， demand， order， desire， request，requirement， insistence， advice， decision ， obligatory(义不容辞的，必须的同位语从句或表语从句中也要用相应的虚拟形式.Eg. His suggestion was that we (should) go at once.Wang insisted that we go at once.B)在It is/was + 某些形容词 + that (表现了说话人的愿望)从句的句型中，that从句中的谓语动词常用虚拟语气，即“should + 动词原形”这些形容词有:important， necessary， essential， imperative， natural， strange，advisable， desirable， possible， probable， astonishing，surprising， desired， suggested， requested， recommended，ordered， proposed， decided， moved等.C) “ should(居然/竟然) + 动词原形(或完成形式)” 可表示惊奇，遗憾，怀疑，不满等.ⅰ. 用于expect， believe， think， suspect 等动词的否定或疑问形式后的宾语从句中.Eg. I never expected that the new apartment should be so small.ⅱ. 用于“It is a pity， it is a shame， it is no wonder 等+ that”等结构后的主语从句中.Eg. It is a pity that he should be so careless.D) 在由for fear that， in case， lest 等引导的状语从句中，用“ should (万一)+ 动词原形” 表示“惟恐”的意思.Eg. He handled the instrument with care for fear that it should be damaged.E) 在“ It is (about/ high ) time + that (从句)(早就应该)” 中，谓语动词常用过去式表表示虚拟语气.Eg. It is high time that Chinese people learnt English.F) 在“as if/ as though”(似乎/好像) 引导的状语从句中，谓语动词与wish的宾语从句的虚拟形式相同.Eg. He w ork s with such enthusiasm as if he never knew fatigue. He speaks English as though he were an American.G) 在 look/sound/feel/ seem + as if / as though从句中，当表示真实情况时，用陈述语气; 否则，用虚拟语气.Eg.It seems as if they know each other. (真实情况)It seems as if they knew each other.It seems as though it were already spring. (虚拟语气)H) 用在if only（如果。

就好了）引起的感叹句中.Eg. If only the driver didn’t drive so fast!虚拟语气: 1)假设类:过去时;2)愿望类:(should) + 动词原形1. If I ____ where he lived，I ____ a note to him.A. knew，wouldB. had known，would have sentC. know，would sendD. knew，would have sent2. If they ____ earlier than expected，they ____ here now.A. h ad started，would beB. started，might beC. had started，would have beenD. will start，might have been3. I didn't know his telephone number. ____ it，I ____ then.A. Had I known，would ring him upB. Should I know，would have rung him upC. If I knew；would ring him upD. Had I known；would have rung him up4. Mary is ill today. If she _____，she ____ absent from school.A. were not ill，wouldn't beB. had been ill，wouldn't have beenC. had been ill，should have beenD. hadn't been ill，could be5. Were I to do it，I ________ it some other way.A. will doB. would doC. would have doneD. were to do1~5 BADAB6. I ________ him the answer ________ possible，but I was so busy then.A. could tell，if it had beenB. must have told，were itC. should have told，had it beenD. should have told，should it be7. Without your help，we________ so much.A. won't achieveB. didn't achieveC. don't achieveD. wouldn't have achieved8. You didn't take his advice. ________ his advice，you ________ such a mistake.A. Had you taken，wouldn't have madeB. If you had taken，would makeC. Were you lo take，shouldn't have madeD. Have you taken，won't have made9. We wish we ____ what you did when we were at high school.A. didB. could have doneC. have doneD. should do10. She wishes she ____ to the theatre last night.A. wentB. would goC. had goneD. were going6~10 CDABC11. Tom is very short now. His mother wishes that he ________ be tall when he grows up.A. couldB. shouldC. wouldD. were able to12. My sister advised me that I ________ accept the invitation.A. couldB. mustC. shouldD. might13. He asks that he ________ an opportunity to explain why he's refused to go there.A. is givenB. must giveC. should giveD. be given14. Do you think of Wang Fang's suggestion that he ________ Mr. Li to the party？A. will inviteB. have invitedC. is invitedD. invite15. I insisted that he ________ at once.A. be goneB. goC. would goD. might go11~15 CCDDB16. Li Ming insisted that he ________ anything at all.A. hadn't stolenB. shouldn't stealC. doesn't stealD. steal17. It i s quite natural that my coming late again ________ them very angry.A. had madeB. would makeC. makesD. m ake18. He acts as if he ________ everything in the world.A. knewB. knowsC. has knownD. won't know19. Read it aloud so that I ________ you clearly.A. may hearB. will hearC. hearD. have heard20. They got up early in order that they ________ they first train.A. caughtB. will catchC. might catchD. shall catch16~20 ADAAC21. I am sorry that he ________ in such poor health.A. areB. shall beC. wereD. should be22. That is a good book. You ________ it yesterday.A. could buyB. should buyC. should have boughtD. bought23. It is high time we ________ home.A. will goB. would goC. have goneD. went24. I'd rather that you ________ home.A. wentB. have goneC. will goD. had gone21~25 DCDAD 26~30 BDDAA25. If only I _________ to the lecture！A. li stenB. will listenC. am listeningD. had listened26. —— If he_____，he ______ that food.---- Luckily he was sent to the hospital immediately.A. was warned，would not takeB. had been warned，would not have takenC. would be warned，had not takenD. would have been warned，had not taken27. I didn't see your sister at the meeting. If she _________，she would have met my brother.A. has comeB. did comeC. cameD. had come28. Without electricity，human life ________ quite different today.A. isB. will beC. would have beenD. would be29. He ________ you more help，even though he was very busy.A. might have givenB. might giveC. may have givenD. may give30. If city noises _______ from increasing，people _______ shout to be heard even at the dinner table 20 years from now.A. are not kept，will have toB. are not kept，have toC. do not keep，will have toD. do not keep，have to31~35 DABBD31. Mike's father，as well as his mother，insisted that he________ home.A. stayedB. could stayC. has stayedD. stay32. Mr. Smith insisted that he ________ the work all.A. had doneB. have doneC. didD. so33. Jane would never have gone to the party ________ that Mary would come to see her.A. has she knownB. had she knownC. if she knowD. if she has known34. If you had enough money，what ________？A. will you buyB. would you buyC. would you have boughtD. will you have bought35. If you ________ that film late last night，you wouldn't be so sleepy.A. didn't seeB. haven't seenC. wouldn't have seenD. hadn't seen36. Our monitor requested that ________.A. all the class studied more carefully the problemB. the problem was more carefully studiedC. with great care the problem could be studiedD. all the class study the problem more carefully37. —— Would you have called her up had it been possible？Yes, but I ________ busy doing my homework.A. wasB. wereC. had beenD. would be38. His tired face suggested that he ________ really tired after thelong walk.A. had beenB. wasC. beD. should be39. It is important that we ________.A. shall close the window before we leaveB. will close the window before we leaveC. must close the window before we leaveD. close the window before we leave40. I didn't know his telephone number，otherwise I ______ him.A. had telephonedB. would telephoneC. would have telephonedD. telephone参考答案1~5 BADAB 6~10 CDABC 11~15 CCDDB 16~20 ADAAC 21~25 DCDAD 26~30 BDDAA31~35 DABBD 36~40 DABDC倒装1．以neither， nor 或so开头的句子或分句，通常用倒装。