1、should / would / could / might + have done3、a. If it should rain tomorrow, we would not go camping.b. if it were to rain tomorrow, we would not go camping.c. If it rained tomorrow, we would not go camping.与将来事实相反：If条件从句谓语：过去式 / should + v原形 / were + to do should / would / could / might + do二、混合虚拟条件句
2、：不同时间的虚拟，各遵守各的规则，如：a. If you had followed the doctors advice, you would be quite all right now.从句叙述与过去事实相反（had + done），主句叙述与现在事实相反（would + v）b. If I were you, I would have taken his advice.从句叙述与现在事实相反（过去式），主句叙述与过去事实相反（would have done）三、虚拟语气在宾语从句中的适用：a. They demanded that the black people （should） be
3、 treated as well as white people.b. He suggested that we （should） start off at once.（建议）His smile suggested that he was satisfied with our work.（暗示，表明）c. I insisted that you （should） give me my money back.（坚决（持），要求）Mike insisted that he had never stolen anything.（坚持说/坚持认为）这类动词有：一坚持（insist），二命令（order
4、, command），三建议（advise, suggest, recommend, propose），四要求（require, request, demand, desire）d. I wish I were a bird.I do wish you would come earlier next time.I wish I had done better in my work.四、虚拟语气在主语从句中的适用：1. It was / is important / vital / necessary / appropriate / proper / right thateg: It is im
5、portant that we （should） think before we decide.2. It is important that we （should） think before we decide.据建议/要求/命令 It is suggested that parents （should） spend more time with their children alone.五、虚拟语气在表语从句中的适用（与表示决定、主张、要求、建议、命令的名词。如：suggestion, proposal, advice, order, demand, requirement等）构成的表语从
6、句常用should + do结构eg：Our suggestion is that the meeting （should） be put off.六、虚拟语气在同位语从句中的适用（与表示决定、主张、要求、建议、命令的名词。suggestion, proposal, advice, order, demand, requirement等）构成的同位语从句中常用should + do结构 Doctors give us some advice that we （should） pay more attention to our health.七、含蓄条件句的虚拟语气：由but for（要不是），
7、Without（要是没有），otherwise（要不然）,but等引导but for the storm, I would have arrived much earlier.Without your help, I wouldnt have passed the driving test.I was too busy at that time. Otherwise I would have called you.I would have come to see you, but I was too busy.注意：句子或主句中的谓语动词的形式视具体情况而定。这是考查考生应变能力的最佳试题。八
8、、虚拟语气的其他用法1、Its （high） time that 从句: （从句用过去式或者should + 动词原形Its high time that you went to school.2、If only（要是就好了）用一般过去式表示与现在或将来事实相反，用过去完成的表示与过去事实相反。If only I were a film star.If only I had known his phone unmber.3、as if引导的方式状语从句中的虚拟语气： He treats me as if I were his own son.She speaks English so flue
9、ntly as if she had learned English in America for years.He learns English so hard as if he would go abroad.4、would rather + that从句中的虚拟语气 I would rather that you paid me now.I would rather that you hadnt done it before.5、虚拟语气也常用于“if it were / had been not for”句型中，意为“要不是” If it were not for peace, we
10、could not be living a happy life today.If it had not been for your advice, I would not have accepted the job.6、省略if的虚拟语气：从句中有were, had, should等词语，省略if，将were, had, should提到句首，如：a. If it should rain tomorrow, we would not go camping.Should it rain tomorrow, we would not go camping.b. If it were to rai
11、n tomorrow, we would not go camping.Were it to rain tomorrow, we would not go camping.c. If I had had the money last year, I would have bought the house.Had I had the money last year, I would have bought the house.（ ）1. If we adequate preparations, the conference wouldnt have been so successful. A.
12、havent madeB. wouldnt makeC. didnt makeD. hadnt made（ ）2. Jack is a great talker. Its high time that he something instead of just taking.A. will do B. has doneC. doD. did（ ）3. Dont handle the vase as if it made of steel.A. isB. wereC. has beenD. had been（ ）4. Sorry, I am too busy now. If I time, I w
13、ould certainly go for an outing with you.A. have hadB. had hadC. haveD. had（ ）5. We lost our way in that small village, otherwise we more places of interest yesterday.A. visitedB. had visitedC. would visitD. would have visited（ ）6. Grace doesnt want to move to New York because she thinks if she ther
14、e, she wouldnt be able to see her parents very often.A. livesB. would liveC. has livedD. were to live（ ）7. We the difficulty together, but why didnt you tell me?A. should faceB. might faceC. could have facedD. must have faced（ ）8. If my car more reliable, I would have driven to Lhasa instead of flyi
15、ng last summer.A. wasB. had beenC. should beD. would be（ ）9. Had they known what was coming next, they second thoughts.A. may haveB. could haveC. must have hadD. might have had（ ）10. Where are the children? The dinners going to be completely ruined.I wish they always late.A. werentB. hadnt beenC. wo
16、uldnt beD. wouldnt have been（ ）11. I through that bitter period without your generous help.A. couldnt have goneB. didnt goC. wouldnt goD. hadnt gone（ ）12. Maybe if I science, and not literature then, I would be able to give you more help.A. studiedB. would studyC. had studiedD. was studying（ ）13. Te
17、achers recommend parents their children under 12 to ride bicycles to school for safety.A. not allowB. do not allowC. mustnt allowD. couldnt allow（ ）14. If he my advice, he wouldnt have lost his job.A. followedB. should followC. had followedD. would follow（ ）15. John went to the hospital alone. If he
18、 me about it, I would have gone with him.A. should tellB. tellsC. toldD. had told（ ）16. The weather has been very hot and dry.Yes. If it had rained even a drop, things would be much better now! And my vegetables .A. wouldnt dieB. didnt dieC. hadnt diedD. wouldnt have died（ ）17. Had I known about thi
19、s computer program, a huge amount of time and energy .A. would have been savedB. had been savedC. will be savedD. was saved（ ）18. I have watched that movie itll give me horrible dreams.A. shouldnt B. needntC. couldntD. mustnt（ ）19. George is going to talk about the geography of his country, but Id rather he more on its culture.A. focusB. focusedC. would focusD. had focused（ ）20. This printer is of good quality. If it break down within the first year, we would repair it at our expense.A. wouldB. shouldC. couldD. might
