If引导的条件,虚拟,宾语从句练习
if虚拟语气的三种时态 虚拟语气考点探析
if虚拟语气的三种时态虚拟语气考点探析英语中有三种语气：陈述语气（表示陈述事实）、祈使语气（表示命令、要求、建议、请求等）和虚拟语气（表示主观愿望、强烈遗憾、建议或与事实相反的假设等）。
近年来，虚拟语气成为高考单项填空题频繁考查的热点，而虚拟语气又是中学生学习英语的难点。
本文将就高考对虚拟语气的考查热点进行逐一分析，梳理考点知识，探讨应对技巧，设置巩固性练习，以期帮助学生应对各种虚拟语气考点项目。
一、考点例析纵观近几年的高考英语试题，虚拟语气主要从以下几个方面考查：（一）if引导的虚拟条件句① If we __________ the other road，we might have arrived here in time for the meeting.（2010年陕西卷）A. take B. had takenC. took D. have taken 解析：从句意和might have arrived 来看，整个":.cssyq.co" ="" class="">句子都是对过去的虚拟，条件状语从句的谓语动词形式应用had+过去分词形式表示与过去事实相反的假设，故选B。
② —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 __________.（2010年":.bjsjob.co" ="" class="">北京卷） A. wouldn＇t die B. didn＇t die C. hadn＇t died D. wouldn＇t have died 解析：本题考查对过去情况的虚拟。
虚拟语气解析以及练习题答案详细解答
虚拟语气解析及练习与答案详解虚拟语气一、虚拟语气的运用练习题及答案解释The millions of calculations involved, had they been done by hand,______all practical value by the time they were finished.A.could loseB. would have lostC. might loseD. ought to have lost解析：这个句子中含有一个省略if，把助动词提前到主语they之前的虚拟条件句，该条件句表示对过去情况的假设，而主句中by the time they were finished表明主句也应该是对过去发生的情况的假设，因而应该选（B）would have lost为正确答案。
2. Had Paul received six more votes in the last election, he our chairman now.A. must have beenB. would have beenC. wereD. would be解析：这道题目是一个混合虚拟语气的句子。
条件句省略了if，把助词had提前到主语前面，表示对过去情况的假设，而主句中now表明了对现在情况的假设，所以应选would(should, could, might)+动词原形这种表达形式。
四个选项中只有（D）是正确表达形式，故为正确答案。
3. If you Jerry Brown until recently, you’d think the photograph on the right was strange.A. shouldn’t contactB. didn’t contactC. weren’t to contactD. hadn’t contacted解析：until recently，因此（D）是正确答案，而主句是隐含的对现在情况的假设，该句是一个混合虚拟条件句。
if的虚拟语气的用法例句
if的虚拟语气的用法例句一、if的虚拟语气简介虚拟语气是英语中一种特殊的语法现象，常用于表示假设情况、与实际情况相反的条件或无法实现的愿望等。
if引导的条件句中，根据其所表示的条件类型和时间性质，使用不同形式的虚拟语气。
二、与现在事实相反的虚拟语气1. 假设条件：如果+动词过去式（be动词用were）例句：If I were a bird, I would fly high in the sky.2. 假设条件：如果+动词过去完成时（had + 过去分词）例句：If he had studied harder, he would have passed the exam.三、与现在事实相反但可能实现的虚拟语气1. 假设条件：如果+动词过去式（be动词用were）结果：主将从现例句：If it rained tomorrow, I would stay at home.2. 假设条件：如果+动词过去完成时（had + 过去分词）结果：主将从现完成例句：If he had invited me, I would have gone to the party.四、与过去事实相反的虚拟语气1. 假设条件：如果+主语+had + 动词过去分词结果：主语+would/could/might + have + 过去分词例句：If I had known the truth, I would have made a different decision.2. 假设条件：如果+主语+had not +过去分词形式，结果也用一般过去时态例句：If we hadn't missed the train, we would have arrived on time.五、与将来事实相反的虚拟语气1. 假设条件：如果+动词过去式（be动词用were）结果：主将从现（应该+动词原形）例句：If they were here, they would help us.2. 假设条件：如果+should/were to/might/could/would + 动词原形结果：主将从现（应该+动词原形）例句：If he should call, please ask him to wait.六、虚拟语气中常用的连词和引导短语1. if: 引导条件状语从句，表示假设情况。
新概念第二册第16课if引导的条件状语从句讲解和练习(基础题)
条件状语从句一、条件状语从句通常由if（如果）, unless（除非），as long as（只要）引导。
例如：If it rains tomorrow, we won’t go to the park. 如果明天下雨，我们就不去公园了。
Unless weather stops me, I go for a walk every. 我每天都会去散步，除非遇上坏天气。
Our parents will be pleased with our performance as long as we try our best.小试牛刀：1、只要我们竭尽全力，父母就会满意我们的表现。
Our parents will be pleased with our performance _____ _____ ______ we try our best.2、如果人人为保护环境做出贡献，世界将会变得更美好。
______ ______ ______ _____ _______ to protecting the environment, the world will become much more beautiful.二、if引导的条件状语从句（1）“if从句+祈使句”的句子。
其实，if作为一个连词，主句也可以是其他形式的句子。
例如：If you want to go, please let me know.If the green light isn’t on, wait for a minute.(2)“祈使句+ and (or)+ 陈述句” 在意思上相当于一个带有条件状语从句的复合句。
注意：A. “祈使句+ and + 陈述句”可以转化为if引导的肯定条件状语从句，而且主语是第二人称。
B. “祈使句+ or + 陈述句”可以转化为if引导的否定条件状语从句，而且主语是第二人称。
例如：Study hard and you will pass the exam. =If you study hard, you will pass the exam.Hurry up, or you’ll be late. =If you don’t hurry up, you’ll be late.考题Work hard，________ you may catch up with your classmates soon.A.orB.butC.andD.yet思路解析：本句是“祈使句＋and”的句型，句意为“努力学习，你会很快赶上其他同学的”，and在句中表示承接关系，所以选C项。
虚拟语气
虚拟语气一、I f引导的条件从句主句从句1、现在would +动词原形一般过去时/were2、将来would +动词原形were to +动词原形/ should +动词原形3、过去would +现在完成时过去完成时Examples：1．If I had time, I would go now.2．If it were to/should snow here tomorrow, we would stay at home.3．If you had studied hard, you would have passed the examination.必须注意如下几点:1. 主句中的would 可换成could（能够/会）might（可能/也许）If I had listened to my father, I might have finished the job in time.2. 混合型的虚拟语气（主句与从句的时间不一致）If you had listened to me, you would be a teacher now.倒装句：当省略if 时，should/were/had 提到主语的前面构成倒装句。
If I had earned enough money, I would have bought a car.--------Had I earned enough money, I would have bought a car.If it were to rain tomorrow, I would not go there.--------Were it to rain tomorrow, I would not go there用其他词或词组来代替if 表示条件without：如果没有/如果不but for：要不是only that/ but that（要不是）otherwise1)But for your help, I would not have succeeded.2)I would go with you only that I am too busy.3)She would have helped us but that she was short of money at that time.4)I am very busy now, otherwise I would go there with you.5)I was very busy yesterday, otherwise I would have gone there with you.二、某些动词后的宾语从句形式：（should）+ do 或(should) + be done建议suggest/propose/advise 命令order/ command要求ask/require/demand/request希望desire坚持insist其他agree/ decide/ determine/ prefer/ urge/ argue/ arrange/ beg/ pray/ prefer/ recommend Example：He suggested that we (should )hand in our homework quickly.He suggested that our homework (should)be handed in quickly.相应的过去分词、名词形式也要用虚拟语气1)Bill suggested that everyone should have a map.（宾语从句）2)It was suggested that everyone should have a map. （主语从句）3)It was Bill’s suggestion that everyone should have a map.（同位语从句）4)His suggestion was that everyone should have a map.（表语从句）5)We are going to discuss his suggestion that everyone should have a map.（同位语从句）三、It is/was + adj. + that……… 形式：should + do/ be doneIt is important that everyone should obey the law.形容词：anxious/ appropriate/ desirable/ eager/ essential/ impossible/ important/ incredible/ insistent/ natural/ necessary/ proper/ possible/ urgent/ vital/ willing四、在lest/ for fear that（惟恐）引导的从句中形式: should+ do/ be doneHe didn’t dare to go out lest someone should recognize him.He didn’t dare to go out lest he sh ould be recognized by the others.五、w ish后的宾语从句1．与现在或将来的愿望相反形式：一般过去时I wish I knew his address./ I wish I could help you.2．与过去的愿望相反形式：过去完时I wish you had written to him.补充内容：1.I wished that I knew his address.2.wish that + would doa. 对现状不满或希望将来有所改变I wish that you would answer my question. I wish the price of the petrel would come down.b. 一种请求I wish you would help me.注意：hope后不用虚拟语气形式六、If only要是……该多好!If only I were a girl.If only I had learned Russian before.七、W ould rather/ would as soon/ would sooner/ had rather 宁愿1.would rather sb. did………2.would rather sb. had done……..Examples:1)I would rather you were a girl. 2)I would rather you had told me the truth.比较：would rather ……. than…….. I would rather die than marry her.I would rather to have gone with you last night. I would rather to have gone with you last night.八、a s if/ as though的从句中He talks as if he knew the answer. He acts as if nothing had happened.比较：He walked here and there，as if looking for something.He opened his mouth as if to say something.九、It is time/ It is about time/ It is high time +sb did该是…….时候了It is time you went to school. It is high time we left for Beijing. 比较：It is time for me to do the job. It is time I did the job.It is the first time I have seen the film十、其他用法1）表示祝愿等（多用动词原形）God damn it!Long live Chairman Mao!So be it.(就这样吧。
if引导的虚拟语气练习题
if引导的虚拟语气练习题精品文档if引导的虚拟语气练习题黄志刚2013.10.一. 简介虚拟语气用来表示说话人的主观愿望或假想，而不表示客观存在的事实，所说的是一个条件，不一定是事实，或与事实相反。
虚拟语气通过谓语动词的特殊形式来表示。
英语中的语气分为陈述语气、祈使语气、虚拟语气在什么情况下用虚拟语气?在表示虚假的、与事实相反的或难以实现的情况时用虚拟语气，表示主观愿望或表示某种强烈情感时，也用虚拟语气。
即当一个人说话时欲强调其所说的话是基于自己的主观想法，而不是根据客观实际，就用虚拟语气。
二. 虚拟语气在非真实条件状语从句中的用法1、真实条件状语从句与非真实条件状语从句真:eg . If he doesn’t hurry up, he will missthe bus. 如果他不快点，他将错过巴士。
If he is free, hewill ask me to tell stories. 如果他是空闲的，他会要求我讲故事。
非真:eg. If I were you, I would go at once.如果我是你，我马上就会去。
If there were no air, peoplewould die. 如果没有空气，人就会死亡。
1 / 37精品文档2、用法及动词形式1、表示与现在事实相反的情况，例1.If I were you, I would take an umbrella.如果我是你，我会带把伞。
2.IfI knew his telephone number, I would tell you. 如果我知道他的电话号码，我就会告诉你。
3.If there were no air or water, there would be no living things on theearth. 如果没有水和空气，地球上就不会有生物。
4.If Ihad any money with me, I could lend you some. 如果我带钱了，我就会借给你些。
虚拟语气讲解与练习
虚拟语气第一部分知识讲解虚拟语气存在于if条件从句中和一些固定结构中,虚拟语气与动词的过去的某种时态形影不离; 虚拟语气是通过谓语动词的变化来实现的;第一节 if 条件状语从句中的虚拟语气一、if 条件状语从句中表示对将来、过去、现在的虚拟If she invites me tomorrow, I shall go to the party.真实条件句如果她明天邀请我参加聚会,我就去.If she invited me, I should go to the party.虚拟条件句说话人认为邀请的可能性较小或不可能If I were you, I should study English. I am not you , so I shall not study English.If I had time, I would attend the wedding. I does not have time, so I will not attend the wedding.You did not take my advice, so you have failed in the examination.If it should rain tomorrow, our picnic would be put off.If it were to rain tomorrow, our picnic would be put off.二、混合虚拟语气条件状语从句表示的行为和主句表示的行为所发生的时间不一致时,动词的形式要根据它所表示的时间来调整.If you had worked hard, you would be very tired. 从句说的是过去,主句指的是现在If he had followed the doctor’s advice, he would be quite all right nowIf I were you, I would have gone home.If you had practiced speaking English every day, you would speak English well enough.如果你当初每天都练习说英语的话,你的英语就会说得很好.三.用介词短语代替条件状语从句可以改为条件状语从句Without air, there would be no living things.相当于:If there were no air, there would be no living things.But for your help, I couldn’t have done it.相当于:If you had not helped me, I couldn’t have done it.四、虚拟语气的倒装：如果条件状语从句的谓语中有were, had或should,就可以倒装;将were, had或should放到句首,谓语主语之前, if去掉; 变为”were/had/should+主语”的形式;如果从句没有were, had或should,就不能倒装;If I were to do it, I’d do it some other way.→ Were I to do it, I`d do it some other way.If you should fail, try again.→ Should you fail, try again.If you had been here earlier, you would have seen him.→ Had you been here earlier, you would have seen him.If you came tomorrow, we would have the meeting.这句话不能倒装.而且,在虚拟条件状语从句中,省略了if的倒装形式的句首不能用动词的缩略形式.如:Were it not for the expense, I would go to Italy.但不能说: Weren`t it for the expense, I would go to Italy.第二节固定结构中的虚拟语气一、.It ishigh timethat……句型中的虚拟语气在此句型中,后面的从句的谓语动词常用过去式,.意思为“现在该……的时候了”It is high time that you got married. It is high time that I lost some weight.二、.wish+宾语从句结构I wish it were Spring all the year round. I wish I were Jane.I wish you could go with us. We wish we had arrived there two hours earlier.三.If only句中的虚拟语气If only he were hereIf only I knew moreIf only he had stayed with usIf only I had taken his advice注：if only也可以用于虚拟条件句中;例如：If only I had more money, I could buy a car.四、在would just as soon 宁愿would sooner 宁愿would just rather 宁愿后的宾语从句中,从句谓语用一般过去时来表示现在或将来要做的事情,若谈及过去的动作,用过去完成时;其后不加that;.I`d rather I were in the rain now.Don’t always make noise. I’d rather you kept silent.五、在in case, for fear that, lest等引导的状语从句中,意为“以免”,从句要用虚拟语气;构成should+动词原形,should也可以省略;Take an umbrella with you in case it should rain.六、as if/as though或even if/even though引导的从句中的虚拟语气如果从句中表示的动作发生在过去,则谓语动词用had+过去分词形式;如果指的是现在的状况,则用过去式;指将来则用wouldshould, could+动词原形.这里只看从句动作发生的时间,与主句的时态没有关系. Some metals look at first sight as though they were gold.When a pencil is partly in a glass of water, it looks as if it were broken.She looks as if/though she were ill.He would not resign even if the heaven should collapse.倒塌七.在表示建议,要求,命令等意思的动词request, require, demand, advise, suggest, propose, recommend, command, order , desire, insist,后面的宾语从句中, 谓语动词用should+动词原形,should可以省略,that不能省略.He suggested that we should have a meeting.The commander ordered that the bridgeshould be bombed.八.与表示请求,建议,命令等动词相对应的名词后面的表语从句,同位语从句用虚拟语气.suggesttion,command,demand,desire,request,requirement,insist,advice,propose,order.Our suggestion is that education not be industrialized.表语从句==We suggested that education not be industrialized.He made a request that heshould be allowed to take 3 days off.==He requested that he be allowed to take 3 days off.九.表示建议,请求,命令动词在以下结构中主语从句“It is suggested/ required/ request/ ordered/ advised/ insisted/ demanded that……”用虚拟语气.It was suggested that he should attend the conference.It was requested that the trial should be reported openly.十.在以下结构中主语从句It is important/ necessary/ strange/ desirable/ advisable/ better/essential/ vital / imperative必须的that…句型中.that引导的从句用虚拟语气,should 可以省略,that不能省略.It is essential that there should be enough food and clothing for the winter;It is desirable that your wedding be postponed until next July.第二部分虚拟语气练习题一、if条件句中表示对过去的虚拟1. ________, he would have come to class.A If Mike is able to finish his homeworkB Would Mike be able to finish his homeworkC If Mike could finish his homeworkD If Mike had been able to finish his homework2. __________your advice yesterday, I would have missed the train.A Had I not takenB If I didn`t takeC If I haven`t takenD Provided I didn`t take3. He ____________ killed last night if he had taken part in the surprise attack on the night.A .might beB would beC might have been D. should have been4. If he had been in better health, he ____________more books.A. can writeB. could have writtenC. could writeD. have written, everything would have been all right.A. He had been hereB. Been here he hadC. Here he had beenD. Had he been here二、混合虚拟语气6. I ________ a little earlier, but I met a friend of mine on the way.A. should arriveB. would be arrivingC. could have arrivedD. arrived三、用介词短语without, but for代替条件状语从句7. ________ your help, I could not have finished my work so early.A withB byC forD without8. Without his wise mother, he _________ such a successful scientist.A. would not becomeB. should not have becomeC. may not have becomeD. could not have become四、It’ s high/abouttime结构9. It’s time the dog __________ how to behave prop erly.A is learningB learnsC learned D. to learn10. It’s high time you _________ the problem carefully about what you will do in the future.A are studiedB must studyC studied D. study11. It’s high time we_______ something to stop road accidents.A are doingB didC will do D. do12. It’s high time __________ about the traffic problem.A. something were doneB. something is doneC. anything will be doneD. nothing to be done五、在wish+宾语从句中13. I wish you __________here last night. All of us were waiting for your arrival.A. cameB. had comeC. comeD. will come六、在would just rather, would just as soon ,would sooner宁愿结构中14. I’d just as soon __________those important papers with you.A. that you won’t takeB. your not taking C please don’t you take D. you didn’t take15. Mr. Smith would just rather we__________ now , but we must go to work.A. not leave B didn’t leave C are not to leave D won’t leave16. I would rather you _____ to the party with her.A goB wentC will goD has gone七、在表示建议,请求,命令的宾语从句中17. Experiments __________that accurate measurements be made.A. showB. proveC. demandD. head18. The teacher insisted that we our homework before 9:00 o’clock.A. finishedB. had finishedC. finishD. was finishing八、表示建议,请求,命令,坚持等同位语、表语从句中的虚拟语气19. One of the requirements for a fire is that the material _______ to its burning temperature.A. is heatedB. will be heatedC. be heatedD. would be heated20. We are all for your proposal that the discussion__________.A. be put offB. was put offC. will be put offD. should put off九、主语从句21. It is requested that the rent for the house _________ in advance.A. will have to be paidB. has to be paidC. should have to be paidD. should be paid22. It is very important that enough money_________ to fund the project .A. be collectedB. must be collectedC. is collectedD. can be collected23. It is necessary that the problem __________ in some way or other.A. is settledB. has been settledC. be settledD. was settled第三部分补充练习1. If you _______5 minutes earlier, you ________ him.A. should come; had seenB. came; would seeC. come; will seeD. had come; would have seen2. He hesitated for a moment before kicking the ball, otherwise he __ a goal.A. had scoredB. scoredC. would scoreD. would have scored3. It is strange that Mr. Zhang ______ such silly mistakes.A. madeB. makesC. makeD. had made4. They demanded that the books ______ to the school library at once.A. returnB. should returnC. be returnedD. would be returned5. How I wish every family _____ a large house with a beautiful gardenA. hasB. hadC. will haveD. had had6. It is high time that we _______ to think how to deal with the money.A. would beginB. beganC. beginD. begun7. If only he _______ quietly as the doctor instructed, he would not suffer so much now.A. liesB. layC. had lainD. should lie8. If I had had enough time, I _______ my work.A. would finishB. must have finishedC. would have finishedD. had finished9. Ten minutes earlier, they ________ the plane.A. will catchB. would catchC. would have caughtD. will have caught10. Mr. Green requires that the students ________ a composition every other week.A. writeB. writtenC. would writeD. will write11. Had he studied hard, he ______ the exam.A. would passB. could passC. had passedD. would have passed12. I wish I _______ what is happening there in this room.A. knowB. knownC. knewD. should know13. If there were no water in the world, everything __________.A. will dieB. would dieC. would have diedD. would have been dead14. _______ what was going to happen, I would never have left her alone.A. Had I knownB. If I knowC. If I knewD. If had I known15. He ordered that the work ________ right away.A. should finishB. finishedC. would be finishedD. be finished16. ---Shall we go to the movie tonight--- No, I’d rather____at home with our baby. You’d better not leave it to the babysitter at night.A. you stayedB. you stayC. stayedD. stay17. Mrs. Black insists _______ in that old hotel.A. not to stayB. not stayingC. staying notD. that she not stay.18. If you had spoken clearly, you would ________ .A. understand itB. have understoodC. be understoodD. have been understoodyou _______ that late movie last night, you wouldn’t be so sleepy.A. haven’t watchedB. hadn’t watchedC. didn’t watchD. wouldn’t have watchedelectronic computers, much of today’s advanced technology __________ achieved.A. will not beB. would not beC. would not have beenD. cannot have beendidn’t let me drive. If we ______ in turn. You _______ so tired.A. drove, didn’t getB. drove, wouldn’t getC. were driving, wouldn’t getD. had driven, wouldn’t have got22. Wouldn’t you rather that your child ______ to bed earlyA. goB. wentC. would goD. goesfor the traffic jam, we _______ on time.A. arrivedB. would arriveC. will have arrivedD. would have arrived24 My suggestion is that he _______ there at once.A. should sendB. would sendC. be sentD. sentonly we ________ about the danger, we could not have joined you.A. knewB. had knownC. should knowD. knowdidn’t see your sister at the meeting. If she ______, she would have met my br other.A. has comeB. did comeC. cameD. had come27.—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 takenelectricity, human life _________ quite different today.A. isB. will beC. would have beenD. would beinsist that a doctor _________ immediately.A. has been sent forB. sends forC. will be send forD. be send formy lawyer _______ here last Saturday, he ______ me from doing.A. had been; would have preventedB. had been; would preventC. were ; would preventD. were; would have prevented31. ________, all the students would hear.A. If the teacher had spoken louderB. If the teacher will speak louderC. Had the teacher spoken louderD. If the teacher spoke louder32. It is of the utmost importance that gasoline ______ smoothly in the engine if the engine is to function properly.A. burnsB. burnC. would burnD. has burned33. What should we do if it_______ tomorrowA. should snowB. would snowC. snowD. will snow34. If you_______ at school, you_________ a college student now.A. had studied hard; would have beenB. should have studied hard; should have beenC. had studied hard; would beD. would study hard; must have beenthe work on time without your help.A. hadn’t finishedB. didn’t have finishedC. couldn’t have finishedD. can’t have finished36. He must have had an accident, or he _________then.A. would have been hereB. had to be hereC. should be hereD. would be here37. _______ I been there, I could have explained it.A. HaveB. ShouldC. WouldD. Hadinsist that a meeting _________ held as soon as possible.A. have beenB. should beC. to beD. being39. Eleven thirty. It’s time we ___________ lunch.A. must prepareB. are preparingC. preparedD. prepare40. The guard at the gate insisted that everybody __________ the rules.A. obeysB. obeyC. will obeyD. would obeyapartment manager demanded ___________ immediately.A. Bill to move outB. that Bill move outC. that Bill moves outD. that Bill moved out42. Look at the terrible situation I am in If only I ______ your advice.A. followB. had followedC. would followD. have followed43. The teacher demanded that the exam ________ before eleven.A must finishB would be finishedC be finishedD must be finished44. They must have been enjoying themselves there, or they ______ so long.A. can’t have stayedB. wouldn’t have stayed.C. needn’t have stayedD. couldn’t stayyou were coming, I’d have met you at the railway station.A. I had knownB. I have knownC. Had I knownD. Have I known46 _________, we could not have finished the work on time.A. If they do not helpB. Should they offer to helpC. But for their helpD. It was not for their help.47. Your suggestion that he ________ till next week is reasonable.A. will waitB. waitC. shall waitD. waits’d rather you ________ anyt hing about it for the time being.A. don’tB. didn’tC. didn’t doD. doI had known how to repair the toaster, I surely ________her.A. will tellB. shall tellC. would have toldD. would tell50. She was busy preparing for the final exam, otherwise she __________you much help.A. would giveB. gaveC. had givenD. would have given。
if条件状语从句讲解与练习
if引导的条件状语从句1) 用法：(1)条件状语从句通常由连词if引导，意为“如果、假如”，主句不能用be going to表示将来，而应该用shall，will。
If you leave now, you are never going to regret it. (错误)If you leave now, you will never regret it. (正确)(2)if “如果”，引导条件状语从句，主句用一般将来时，从句则用一般现在时，如：If it rains tomorrow, I shan’t climb the hills.(3)另外，主句是祈使句或含有情态动词，从句也用一般现在时。
如：Please call me if he comes next Sunday.Can you call the policeman if you are in the trouble.注意宾语从句中的if与条件状语从句if的区别。
宾语从句中的if“是否”相当于whether，引导宾语从句，时态需根据语境确定。
如果主句用一般现在时，从句可以根据具体情况选用时态，如果主句用一般过去时，从句必须用过去式的某种形式。
I don't know if it will rain tomorrow. 我不知道明天是否会下雨。
Our teacher said there was going to be a football match the next month.我们说下月将有场足球比赛。
【边学边做】用括号内所给词的正确形式填空。
1. What will you buy if you ________（have）a lot of money?2. If it __________（not snow）tomorrow, we will feel unhappy.3. You mustn’t go to school if you ________（be）still in bed.4. If he _______（be）at home at that time, he would know it.5. Please show me the way if you ________（know）it.6. You will hurt your teeth if you ________（eat）too much candy.7. If you gave me a toy car, I _________（be）very happy.8. I would get the prize if I _________（work）hard.9．If she ______ (finish ) work early ,she ______(go) home.10．If the weather______（be）fine，we_______(go)for a walk .11. If I_____(have) time tonight ,I _______(finish) the book I’m reading.12. If it ______(rain) next weekend , we_______(not be able to ) plant the vegetable .13. If it_______(rain),we______(stay) at home .14.If she______(arrive) ,she _____(phone) me .15. If he_____(call),tell him I’ll ring back .if 条件状语从句的时态练习一．在正确的答案下划一条线。