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)
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?。
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if条件句讲解及练习撰稿：胡秋明审稿：赵克险责编：白雪雁本单元语法讲解一、 will 和be going to 表示推测、揣想will 更强调依据直觉、知识和经验做出的推测。
例如：This will be the house you are looking for.You will be in time if you hurry.be going to 更强调依据当时可以观察到的证据、事实做出的推测。
例如：Look at those clouds. I think it is going to rain.--- Watch out! He is going to hit that ball again.---It's going to be a very interesting movie.二、含if的真实条件句和虚拟条件句（1）在英语中，语气是动词的一种形式，用来表示说话人的意图或态度。
英语的语气有三种：陈述语气（表示所说的话是事实），祈使语气（表示所说的话是请求或命令）和虚拟语气（表示所说的话只是一种主观的愿望或假设或建议等）。
如果所表示的条件是真实的，或者完全有可能实现的，叫真实条件句，主句和从句的谓语都用陈述语气。
如：If she doesn’t hurry up, she will miss the first bus.如果所表示的条件不可能实现或者实现的可能性很小时，叫非真实条件句，主句和从句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 for the 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 ill; 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 actuallyhe 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’clock 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 hometo 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. haven’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。