IF 从句主句与过去情况相 反时与现在情况相 反时与将来事实可 能相反时had donewould have donedid (be 用were)would do1) did 2)should+动原 3) were to+动原would do1. If there were no air, the sky would be black.If I got the information, I would let you know.2. If we had got enough money, we would have bought it.3. If you should fall, you would be injured.If it were to rain, we would not go there.If you had a villa, I would marry you. 现在过去将来# Exercises 1. If I _ more time, I would have gone with him. A.had B. had had C. have had D. would haveB2. If I _you, I wouldnt return thecall. A. be B. am C. was D. wereD( 过去)( 现在)a. If they _ (be) here now, they _ (take) your advice.b. If the world-war _ (break) out again, what _ (happen) to our people on earth?were would take break would happenPRACTICE 1: Fill in the blanks.c. If I _ (be) in your position, I _ (ask) for teachers help.werewould aska. If Tom _ (be) more careful in the exam, he _ (pass) it already.b. If you _ (get) up earlier, you _ (catch) the first train.had beenwould have passedhad gotwould have caughtPRACTICE 2: Fill in the blanks.c. If I _ (meet) you yesterday, we _ (go) to the concert together.had metwould have goneIf he _ more carefully, he _ the car accident yesterday.had driven would not have had a. If there _ (be) no natural resource any more, we _ (make) use of nuclear power .b. What _ (happen) if you _ (get up) too late tomorrow?should bewould makewould happenshould get upPRACTICE 3: Fill in the blanksc. If Robots _ (control) the world some day, here _ (be) no friendship.were to controlwould be假如他来了, 我们对他说什么呢？If he were to come, what should we say to him.假如他看见我, 就会认识我。If he should see me, he would know me.在虚拟条件句中，若有动词were, should 或had（+过去分词），可 以省略if, 且把这三个词放在主语之 前，变成倒装句。If I were a bird, I would fly freely . =Were I a bird, I would fly freely .1.If you were handsome, I would marry you.2.If he should come tomorrow, I would give it to him.3. If it were to snow, I would not go .4. If he had come yesterday, you would have seen him.Should he come tomorrow, I would give it to him.=Were you handsome, I would marry you.Were it to snow, I would not go.Had he come yesterday, you would have seen him.3. _ he finished the work, he would not have been punished. A. If B. wereC. had D. hasC( 过去)I wish与过去愿望相反 ：had doneI wish I had seen that film.与现在愿望相反 ：did/wereI wish I were as handsome as you.与将来愿望相反：would/could /might+动词 原形 I wish I would try again.3. How I wish I _ a grown-up! A.were B. had been C. was D. amA( 现在)I wish I _as tall as you.wereI wish I _a bird.wereI wish every day _my birthday.wereI wish/wished I _( eat ) so much watermelon.hadnt eatenThe party was terrible, I wish I _ ( go ) to it.had never goneI wish it _( rain) tomorrow.would rainIf you had asked him yesterday, you would know what to do now.从句与过去事实相反, 主句与现 在事实相反混合虚拟/ 错综虚拟语气If the staff _more careful, the mall _on fire now.had beenwould not be句型练习.1. 我要是你的话, 我就会把英语学好。 2. 如果你昨天来, 你就会看见他。 3. 万一明天下雨, 我们就不到那儿去。 4. 我希望我十年前认识他。Homework1. suggest, order, demand, request, desire, insist等动词后的 宾语从句常用I suggest (that) he (should) go to see the doctor today.I order that you not disturb others in classclass.“ should+动词原形”，should可以省略。2. It is suggested/desired/ordered/ necessary/importantthat 等结构后的主语从句:It is necessary that we (should)enjoy ourselves to the bars .3. # It is time that 从句动词一 般用过去时态e.g. It is time that we went to sleep.4. should ( might, could, would, need) have done sthe.g. Ululant, you should not havedied so earlier!I need not have cried so much,since I was left so much fortune. 5. as if引导的状语从句， 有时用虚拟e.g. She acts as if she were a beauty.6. if onlye.g. If only that I were not so thin.I would rather that you passed away right now.I would rather you had been here yesterday.7. would rather3. -Do you have a computer?-No, but I wish I _ one .A. have B. hadC. having D. have had B B4. -I feel I am so tired tonight.-Well, it is time that you_.A. go to bed B. would go to bedC. went to bed D. going to bedC C( 现在)( 特殊)5. It is necessary that the lazy boy_the class meeting.A. will attend B. attends C. attend D. attendedC C6. If I had seen the movie, I_ youall about it now. A. would tell B. will tell C. have told D. would have toldA A( 特殊)( 错综)