if条件句讲解及练习

合集下载

if引导的条件状语从句讲解和练习(答案)

t 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 ’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 protectingthe 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。

if虚拟语气的用法归纳

if虚拟语气的用法归纳IF虚拟语气是英语中的一种重要语法现象，主要用于表示与现实相反的假设、愿望、建议等。

它分为两种形式：if条件句和if非条件句。

以下是对IF虚拟语气用法的详细介绍：一、if条件句1. 表示与现在事实相反的假设：If + 主语+ 过去时态，主语+ would/could/might/should + 动词原形。

例如：If I were you, I would go to the party.（如果我处在你的位置，我会去参加派对。

）2. 表示与过去事实相反的假设：If + 主语+ had done，主语+ would/could/might/should + have done。

例如：If he had come to the meeting, he would have known the plan.（如果他参加了会议，他就会知道这个计划。

）二、if非条件句1. 表示建议、劝告：主语+ should/would/might/ought to + 动词原形。

例如：You should go to the party.（你应该去参加派对。

）2. 表示愿望：主语+ could/would/might + 动词原形。

例如：I wish I were a bird.（我希望我是一只鸟。

）3. 表示假设：If + 主语+ 动词过去式，主语+ would/could/might + 动词原形。

例如：If I had time, I would go to the park.（如果我有时间，我会去公园。

）三、if虚拟语气的特殊结构1. 省略if，将were、had、should等词置于主语之前：主语+ were/had/should + 动词原形。

例如：She were here, she would meet him.（如果她在这里，她会见到他。

）2. 使用倒装结构：were/had/should + 主语+ 动词原形。

If条件状语从句讲解及练习

引导条件状语的三个从属连词1.if的用法。

其意为“如果”：He’ll do it if you pay him. 如果你付钱他是会干的。

If you ask him, he will help you. 如果你向他请求，他会帮助你。

2.unless的用法。

其意为“如果不”、“除非”：I shall go there tomorrow unless I’m too busy. 如果我不太忙，明天将到那儿去。

Unless you go at once you will be late. 如果你不马上走，就会迟到的。

[so] long as的用法。

其意为“如果”、“只要”：As long as you do your best, we’ll be happy. 只要你尽力，我们就满意了。

You can go out you promise to be back before 8. 如果你保证八点以前回来，你可以出去。

状语的说明在时间和条件状语中，通常要用一般现在时表示将来意义，而不能直接使用将来：Tell him as soon as he arrives. 他一来就告诉他。

(不能用will arrive)I won’t go if it rains tomorrow. 要是明天下雨，我就不去。

(不能用will rain)有时也可见到if you will 这样的说法，但那不是将来，而是表示意愿或委婉的请求(此时的will是)：If you will wait a moment, I’ll fetch the money. 请等一下，我就去拿钱。

* truths, facts, things which always happen原理，客观事实，规则例句：If you cool the water, it turns into ice.结构: if从句（一般现在时）+ 主句（一般现在时）** possible things now or in the future. 可能会发生的事引导词是if（如果）.如果主句是一般将来时，条件状语从句只能用一般现在时.例句：If you stay at home, I'll go.如果你呆在家里，我就走。

if_条件状语从句

if_条件状语从句条件状语从句（讲解&练习）if引导的条件状语从句引导条件状语从句最常用的连词是if，常见的if条件状语从句表示在某条件下，某事很可能发生，条件是可能存在的，主句中某种情况发生的概率也是很高的。

如：If you ask him，he will help you．如果你请他帮忙，他会帮你的。

If you fail in the exam，you will let him down．如果你考试不及格，你会让他失望的。

1．if从句用一般现在时，主句用一般将来时If he runs, he’ll get there in time. 如果他用跑的，他就会及时赶到那儿。

2．if从句用一般现在时，主句用may/might/canIf the fog gets thicker the plane may/might be diverted. 如果雾在大一些，飞机可能就会改在别的机场降落。

If it stops snowing we can go out. 如果雪停了，我们就可以出去。

3．if从句用一般现在时，主句用must/shouldIf you want to lose weight you must/should eat less bread. 如果你想减肥，你必须少吃面包。

5．if从句用现在进行时，主句用一般将来时If you are looking for Peter you’ll find him upstairs. 如果你是在找彼得，上楼就会找到他。

if 条件句不一般,几个要点记心间; 条件句,放在前, 逗号要放句中间。

条件句表真实，主将从现要遵从；条件句非真实，虚拟语气用到位。

注意：if还可以引导虚拟条件句，表示不可实现的条件，从句中多用一般过去时或过去完成时。

What would happen if there were no water ? 如果没有水会怎样？2.unless引导的条件状语从句unless的意思是如果不，除非。

if引导的条件句是什么从句

if引导的条件句是什么从句if 引导的条件句有真实条件句和非真实条件句两种；1、真实条件句：叙述真实可能发生的事情；例句：If you fail in the exam,you will let him down.如果你考试不及格，你会让他失望的。

扩展资料2、非真实条件句：虚拟语气的一种，表示与实际已发生事实相反：例句：If I were you, I would invite him.如果我是你，我会邀请他。

3、另一个常用连词为unless,大多数时候意思与 if not 相近：例句：Let's go out for a walk unless you are too tired.我们出去散步吧，除非你太累了。

例句：If you are not too tired, let's go out for a walk.如果你不太累，我们出去散步吧。

条件状语从句的基本用法1、用if引导：if意为“如果”。

例句：If you cheat in the exam you’ll never get away with it.考试作弊必予追究。

2、用unless引导：unless的意思是“如果不”“除非”。

例句：Unless you go at once you will be late.如果你不马上走，就会迟到的'。

3、用as [so] long as引导：as [so] long as的意思是“如果”“只要”。

例句：I’ll remember that day as long as I live.只要我活着，我就不会忘记那个日子。

4、用in case引导：in case用连词引导条件状语从句时，其意为“如果”“万一”。

例句：In case I forget, please remind me about it.万一我忘记，请提醒我一下。

5、条件状语从句的时态：当主句为将来时态或含有将来意义时，条件状语从句习惯上要用一般现在时表示将来意义，而不能直接使用将来时态。

if条件句讲解及练习

if条件句讲解及练习If I were you, I would not let out the secret.如果我是你的话，我不会泄露这个秘密的。

If I knew his new address, I would tell you.如果我知道他的新地址，我会告诉你的。

If he studied harder, he would pass the exam.如果他学习再努力点的话，他会通过考试的。

If we had made fuller preparation, we should have won the game.如果我们做了更充分的准备的话，我们肯定就赢了这场比赛。

If you had taken my advice, you wouldn’t have been late forthe meeting.如果你听了我的建议，你开会就不会迟到了。

If she were to/should come, I would tell her the secret.万一她来的话，我会告诉她这个秘密。

（2）省略if的虚拟条件句在含有were, had, 或者should 等词的虚拟条件句中，可以省略if, 将were, had或者should这些助动词放在句首。

如：Were I you, I would not let out the secret.Had we made fuller preparation, we should have won the game.Had you taken my advice, you wouldn’t have been late for the meeting.Should she come, I would tell her the secret.高一语法练习（四）预测、if条件句及虚拟语气一、单项选择1. If I _____ where he lived, I _____ a note to him.A. know, would have sentB. had known, would have sentC. know, would sendD. knew, would have sent2. Mary is ill today. If she _____, she _____ absent from school.A. were not il l; wouldn’t beB. had been ill; wouldn’t have beenC. had been ill; should have beenD. hadn’t been ill; could be3. He acted as if he _____ everything in the world.A. knewB. knowsC. has knownD. won't know4. If you had enough money, what _____?A. will you buyB. would you buyC. would you have boughtD. will you have bought5. If Mr. Young _____ with justice, he _____ such a wrong thing.A. were treated; wouldn’t doB. had been treated; wouldn’t have doneC. were treated; wouldn’t have doneD. had been treated; wouldn’t do6. What _____ if there _____ no light during the day?A. will happen; wasB. would happen; isC. happens; wereD. would happen; were7. The spokesman acted that way as if he _____ anything about the accident but actually he did.A. doesn’t hearB. didn’t hearC. haven’t heardD. hadn’t heard8. If it _____ not for the fact that you _____ ill now, I would surely punish you.A. is; areB. were; wereC. were; areD. was; were9. Many Chinese movie stars now have given up their Chinese nationality. If I were them, I _____ that.A. shouldn’t doB. didn’t doC. hadn’t doneD. won’t do10. I want to get back by 5 o’c lock if _____.A. likelyB. canC. possibleD. probable11. It seems as if it _____ already summer now but it is only February.A. isB. wasC. wereD. had been12. If Henry had not pulled his cap low over his brow, he _____ by the police.A. might be recognizedB. might have been recognizedC. would have recognizedD. was to have been recognized13. There is a ring at the door. That _____ be the postman, I suppose.A. willB. wouldC. is going toD. was going to14. Look at the dark clouds—there _____ be a storm.A. willB. must have beenC. is going toD. would15. —Why are you taking the pictures down?—I _____ the wall.A. paintB. have just paintedC. am going to paintD. will have painted16. —Can I stay at home tomorrow?—Yes, you can if it_____.A. will snowB. is going to snowC. snowsD. snowed17. I don’t know if he _____ this afternoon. But if he _____, I will tell you.A. will come; will do;B. comes; will doC. will come; doesD. comes; does18. —I thought I asked you to fix the radio.—Oh, I’m sorry. I _____ it right away.A. am to doB. will doC. was about to doD. am going to do19. The WTO can’t live up to its name _____ it does not include a country that is home to one fifth of mankind.A. as long asB. whetherC. ifD. even though20. Ask him to ring me up if you _____ him.A. seeB. sawC. would seeD. will see21. It’s so late. I don’t think he ______ come.A. wouldB. shouldC. is going toD. shall22. If people _____ polluting the air, animals and plants will die soon.A. don’t stopB. didn’t stopC. shall not stopD. hav en’t stopped23. If you _____ an interesting day out, ______ the Science Museum.A. want; visitingB. want; visitC. want to; visitD. wanting; visit24. If the pure water is heated to 100 centigrade degrees, it ______ boil.A. is going toB. willC. wouldD. is to25. Is a dictionary available, _____ so, where?A. ifB. if isC. and ifD. and if is二、翻译句子26. 要是我哥哥在这儿，一切都没问题了。

小学英语if 引导的条件状语从句讲解

if引导的条件状语从句（包含主将从现原则）一.if的位置：if“如果”，当引导条件状语从句时，既可以放在主句前面，也可以放在主句后面。

若if引导的条件句放在句首，从句后面要加逗号与主句隔开。

例如：My mother will take me to the park if she is free.如果我妈妈有空，她就会带我去公园。

If my mother is free, she will take me to the park.如果我妈妈有空，她将会带我去公园。

（此句if引导的条件状语从句位于句首，主句位于其后，所以要用逗号隔开）二.时态的运用注意：在if的条件状语从句中，主句为下列情形之一时，if条件状语要用一般现在时。

1.主句是一般将来时（主将从现）例如：If he comes, he will tell me all.如果他来了，他会告诉我所有（的事情）。

（这个知识点在初中阶段是常考题，简称“主将从现”——主句是一般将来时态，从句是一般现在时态。

本句中主句是由will引导的一般将来时态的句子，从句是由if引导的一般现在时态的句子，符合主将从现的法则。

）2.主句是含有情态动词may/might/can/must/should等句子。

例如：If you want to lose weight, you must eat less bread.如果你想减肥，你必须少吃面包。

（主句中含有情态动词must，所以if引导的条件状语从句要用一般现在时态。

）3.主句是祈使句例如：If you are not strong enough, please don't take part in such an activity.如果你不够强壮，请不要参加这种活动。

（主句是一个Do型的祈使句，所以根据原则，if从句要用一般现在时态。

——不清楚Do型祈使句的小伙伴可以查看冉老师历史发文记录）三．习题1.If you to be a rich man ,you should try hard.A. wantingB. wantedC. wantD.are want2. If you English, you can be an English teacher.A. likingB. likedC. likeD. are like3. If you like sports , you a PE teacher.A. areB. mustC. can beD. could。

If条件句练习附答案

If条件句练习:一．用if连接下列句子：1.It rains tomorrow.We won’t go for a picnic.If it rains tomorrow, we won’t go for a picnic.2.The children come home early.They will play in the garden. If the children come home early, they will play in the garden.3.He has a lot of money.He will buy a new car.If he has a lot of money,he will buy a new car.4.I am free.I’ll come here.If I am free, I’ll come here.5.He is rich.He will live abroad.If he is rich, he will live abroad.二．翻译下列句子：1.如果你摔下来，你会伤到自己。

If you fall, you’ll hurt yourself.2.如果我错过了公交车，我就坐车租车。

If I miss the bus, I’ll take a taxi.3.如果你明天病了，你就别去上班了。

If you are sick tomorrow, don’t go to work.4.如果他有很多钱，他就坐飞机去纽约。

If he is rich, he’ll go to New York by plane.5.如果他们给你更多的钱，你会做什么？If they give you more money, what will you do?。

人教版中考英语语法知识点If+引导的条件句+练习

语法专题：条件状语从句（1）if条件句：有可能性结果发生的行动，在这些句子中，动词的时态是不同的，if 引导的条件状语从句中，主句用一般将来时态，从句用一般现在时态（主将从现）If it doesn’t rain（从句）, we’ll have a picnic tomorrow（主句）.We’ll have a picnic tomorrow, if it doesn’t rain.（if引导的从句可置前可置后）（2）主祈从现（祈使句+if+一般现在时态）Put up your hands if you have any questions to ask. 如果你们有问题问的话，请举手。

当主语是you时，if 引导的条件状语从句可以与”祈使句+and/ or +简单句”进行句型转换。

And 表示句意顺承，or 表示转折，意为”否则”。

Take care , or you will fall off the tree. = If you don’t take care, you’ll fall off the tree. 小心，否则你会从树上掉下来。

（3）主情从现（情态动词+if +一般现在时态）If I get there early, I can see the doctor quickly.（4）句型：will do式be going to do式肯定从句If主语+动词+其他, 主语+will(won’t) do+其他. If主语+动词+其他, 主语+be(be not) going to do+其他.否定从句If主语+be+not+其他, 主语+will(won’t) do+其他. If主语+be+not+其他, 主语+be(be not) going to do+其他.If主语+don't/ doesn't +动词原形+其他, 主语+will(won’t) do+其他. If主语+don't/ doesn't +动词原形+其他, 主语+be(be not) going to do+其他.If the picture is silly, strange and colourful, you will remember it better.If I have time, I am going to visite you .I will go to the park if it doesn’t rain tomorrow . I won't go to the park if it rains tomorrow.专题精讲实战演练题型1：单项选择( ) 1. If the robot ___________ wrong，you can get a new one for free or get all your money back.A. wentB. goesC. would goD. will go ( ) 2. —We’ll go for a picnic if it ___________ on Sunday.—Wish you a lovely weekend.A. rainB. doesn’t rainC. won’t rainD. rains ( ) 3. I’ll do it better if the teacher ___________ me another chance.A. giveB. givesC. gaveD. will give( ) 4. If a polar bear ___________, it ___________ fish from the waterA. will be hungry；catchesB. is hungry；will catchB. is going to be hungry；catches D. is hungry；won’t catch( ) 5. If our government ___________ attention to controlling food safety now, our health ___________ in danger.A. won’t pay; isB. doesn’t pay; isC. won’t pay; will beD. doesn’t pay; will be( ) 6. We will go for a picnic if it___________ tomorrow.A. doesn’t rainB. wasn’t rainyC. won’t rainD. wasn’t raining( ) 7. If the pure water is heated to 100 centigrade degrees, it___________ boil.A. is going toB. willC. wouldD. is to ( ) 8. She will go to America___________ she has much free time and money.A. as long asB. butC. thoughD. although( ) 9. We will go to the West Lake___________ it doesn’t rain heavily tomorrow.A. ifB. unlessC. as long asD. once ( ) 10. I won’t call you, ___________ something unexpected happens.A. unlessB. whetherC. becauseD. While Keys: 1-5 BBBBD 6-10ABAAA题型2：以所给词的正确形式填空1. If he ________ (study) hard, he will get good grades.2. Everyone must wear uniforms. If you don't, they ___________ (let) you in.3. If you stand at the top of the mountain, you _________ (see) the view of the whole city.4. My grandfather will wear a pair of glasses if he__________ (read) newspapers.5. Please turn off the light if you ________ (leave) the classroom.6. We’ll go for a picnic unless it ________(rain) this Sunday.7. Mr Smith ________ (let) you know if he needs help.8. If you walk along the street, you ________ (see) many foreigners.9. If Mary ________ (ask) me for help，I will try my best to help her.10. I don't know if it will snow tomorrow. If it_______ (snow)，we'll make snowmen. Keys:1. Studies 2.won’t let 3. will see 4. reads 5.leave6.doesn’t rain7.will let8.will see9. asks 10.snows直击中考题型1：单项选择( ) 1.—I wonder if your wife ________ to the party.—If your wife _________, so will mine.A. will go, goB. will go, goesC. goes, will goD. will go, will go ( ) 2. If he _________ in half an hour, we _________ wait for him.A. won't come, won'tB. won't come, don'tC. doesn't come, won'tD. will come, don't ( ) 3. I will send you an e-mail as soon as I_________ in Canada.A. arriveB. arrivedC. am arrivingD. will arrive( ) 4. If there ________ no buying and selling of animals, there _________ no killing in nature.A. is; will beB. will be; will beC. is; isD. will be; is ( ) 5. You can’t watch TV ________ you finish your homework.A. beforeB. ifC. whileD. asKeys:1-5:ACAAA。

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引导的条件状语从句讲解

条件状语从句在句子中做条件状语的从句称为条件状语从句。

通常置于句首或句尾。

一．条件状语从句通常由if（）, unless（），as long as（）引导。

例如If we pay much attention to the earth, we'll have a better world.如果我们多关爱地球，就会拥有一个更美好的世界If it rains tomorrow, what shall we do?如果明天下雨，我们怎么办？尝试一下：（补全句子）If it rains tomorrow, we won’t go to the park.______________________________________。

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。

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.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. =_________________________________________.Hurry up, or you’ll be late. =__________________________________________________..考题(2010重庆中考)Work hard，________ you may catch up with your classmates soon.A.orB.butC.andD.yet黑色陷阱：本题的陷阱是句型，本句型区别于“祈使句＋or”，这个句型的含义是“……，不然的话/否则……”。

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。

if 条件从句

if 条件从句if 条件从句是英语中非常常见的一种句式，用来表达假设、条件和可能性。

在本文中，将列举不少于10个关于if 条件从句的例句，以及对其进行解析。

以下是例句及解析：1. If it rains tomorrow, I will bring an umbrella.如果明天下雨的话，我会带把伞。

这个例句表达了一个条件，即如果明天下雨，我就会带伞。

如果条件成立，我会采取相应的行动。

2. If I had enough money, I would buy a new car.如果我有足够的钱，我就会买一辆新车。

这个例句表达了一个假设，即如果我有足够的钱，我就会购买一辆新车。

然而，事实并非如此，我没有足够的钱，所以这个假设是不成立的。

3. If you study hard, you will pass the exam.如果你努力学习，你就会通过考试。

这个例句表达了一个条件，即如果你努力学习，你就会通过考试。

这是一种可能性，但要实现这个可能性，你需要付出努力。

4. If I see her, I will say hello.如果我看到她，我会打招呼。

这个例句表达了一个条件，即如果我看到她，我就会打招呼。

这是一种可能性，如果我遇到她，我会主动打招呼。

5. If you don't hurry, you will miss the train.如果你不赶快，你会错过火车。

这个例句表达了一个条件，即如果你不赶快，你就会错过火车。

这是一种可能性，如果你不加快速度，你会错过火车。

6. If I were you, I would quit that job.如果我是你，我会辞掉那份工作。

这个例句表达了一个假设，即如果我是你，我会辞职。

然而，事实并非如此，我并不是你，所以这个假设是不成立的。

7. If it snows tomorrow, we will go skiing.如果明天下雪，我们会去滑雪。

if引导的条件状语从句精讲与专题练习（2）

八年级英语‎：i f引导的‎条件状语从‎句常见的if‎条件状语从‎句表示在某‎条件下，某事很可能‎发生，条件是可能‎存在的，主句中某种‎情况发生的‎概率也是很‎高的。

如：If you ask him，he will help you．如果你请他‎帮忙，他会帮你的‎。

If you fail in the exam，you will let him down．如果你考试‎不及格，你会让他失‎望的。

If you have finis‎h ed the homew‎o rk，you can go home．如果你作业‎做完了就可‎以回家了。

另外，if从句还‎表示不可实‎现的条件或‎根本不可能‎存在的条件‎，也就是一种‎虚拟的条件‎或假设。

从句多用一‎般过去时或‎过去完成时‎，表示对现在‎或过去的一‎种假设。

如：If I were you，I would‎invit‎e him to the party‎．如果我是你‎，我会邀请他‎参加聚会。

(不能用wa‎s)I would‎have arriv‎e d much earli‎e r if I had not been caugh‎t in the traff‎i c．要不是交通‎堵塞，我本会来得‎早一些。

另外你还要‎注意if 条件句的时‎态搭配1．if从句用‎一般现在时‎，主句用一般‎将来时If he runs ，he’ll‎get‎there‎in time.如果他用跑‎的，他就会及时‎赶到那儿。

The cat will scrat‎c h you if you pull her tail.如果你拉猫‎的尾巴，它就会抓你‎。

2. if从句用‎一般现在时‎，主句用ma‎y/might‎/canIf the fog gets thick‎e r the plane‎may/might‎be diver‎t ed.如果雾在大‎一些，飞机可能就‎会改在别的‎机场降落。

if 引导的条件句

if 引导的条件句if引导的条件句表示在某种条件下，会导致另一事发生。

句式为if + 从句，主句。

中文意思是“如果某事发生（或不发生），另一事就（不）发生”。

通常分以下两种情形：一、真实条件句1. if从句和主句都用一般现在时，表示客观真理或习惯和持续发生的事情。

如：If the moon goes near the earth, the tide goes high. 如果月亮离地球距离近，潮水就高。

2. if从句用一般现在时，主句用一般将来时，表示从句中的动作如果发生，那么主句中的动作也将发生。

如：If it stops raining later this afternoon, we will eat out. 如果今天下午晚些时候雨能停，我们就出去吃饭。

3. if从句用一般现在时，主句用祈使句，表示给某人提建议或命令某人做某事，及提出建议或请求。

如：If you are not likely to be in town, please let me know. 如果你不可能在城里，请让我知道。

二、虚拟条件句虚拟条件句，也称非真实条件句，表示在某种假想的条件下，将导致某事发生。

从句中所陈述的事情仅仅只是说话者的想法，不是事实，也不可能发生。

1. if从句用一般过去时（did / were），主句用would / could / should / might + do，表示现在不可能发生的事情，if 从句中所陈述的事情与现在的事实相反。

如：If I were Liu Xiang, I would train hard for the 2008 Olympic Games.如果我是刘翔，我会为了2008年奥运会努力训练。

2. if从句用一般过去时（did / were或were to + do），主句用would / could / should / might + do。

表示将来不可能发生的事情，if 从句中所陈述的事情与将来的事实相反。

if句式的用法

千里之行，始于足下。

if句式的用法if句式是英语中常用的一种条件句句式，其结构为“if + 条件句，主句”。

if句式用来表达假设、条件、可能性等含义。

在下面的文章中，我将具体介绍if句式的用法，并举例说明。

一、表示真实状况的if句式假如if后面的条件句表示的是实际上存在的状况，那么主句中的内容就是对这个存在状况所作出的描述或推断。

例句1：If it rains, we will stay at home.假如下雨，我们就呆在家里。

例句2：If you study hard, you will pass the exam.假如你努力学习，你就会通过考试。

例句3：If she is tired, she goes to bed early.假如她累了，她就早点睡觉。

二、表示假设状况的if句式假如if后面的条件句表示的是一种假设、虚拟的状况，那么主句中的内容通常是对这种假设状况所作出的推断、建议或者标明可能性。

例句1：If I were you, I would apologize to her.假如我是你，我会向她赔礼。

例句2：If you had studied harder, you would have passed the exam.假如你更努力学习了，你本可以通过考试的。

第1页/共3页锲而不舍，金石可镂。

例句3：If it doesn't rain tomorrow, we will have a picnic.假如明天不下雨，我们就去野餐。

三、表示习惯、规章的if句式if句式还可以用来表达习惯、规章、定理等。

例句1：If you heat water to 100 degrees Celsius, it boils.假如你将水加热到100摄氏度，它就会沸腾。

例句2：If it is Sunday, I always go shopping.假如是星期天，我总是去购物。

例句3：If you touch fire, you will get burned.假如你触碰火，你会被烧伤。

if条件句讲解及练习

if引导的条件状语从句讲解和练习(答案)

if虚拟语气的用法归纳

If条件状语从句讲解及练习

if_条件状语从句

if引导的条件句是什么从句

if条件句讲解及练习

小学英语if 引导的条件状语从句讲解

If条件句练习 附答案

人教版中考英语语法知识点If+引导的条件句+练习

虚拟语气讲解与练习

if引导的条件状语从句讲解

if条件状语从句讲解与练习

if 条件从句

if引导的条件状语从句精讲与专题练习（2）

if 引导的条件句

最新中考初中英语 if条件句 讲解及练习

if句式的用法

If条件句练习附答案

最新中考初中英语 if条件句讲解及练习