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if条件句讲解及练习

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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 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 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 haveC. 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 punishA. 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. is B. 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 _____ itright 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 to B. 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。

27. 如果下雨，庄稼就得救了。

28. 如果你昨天早点来，你就碰见他了。

29. 他那样对待我，好像我是他儿子似的。

30. 他们谈话的样子好像是多年的朋友一样。

31. 我想今天下午不会下雨。

32. 你下星期把车借给我行吗？33. 发生的事我谁也不告诉。

34. 我们不准备在那里多呆。

35. 我难受极了，我想我要生病了。

Keys:1—5 BAABB 6—10 DDCAC 11—15 CBACC 16—20 CCBCA21—25 CABBC26. If my brother were here, everything would be all right.27. If it should rain, the crops would be saved.28. If you had come earlier yesterday, you would (might) have met him.29. He treats me as if I were his son.30. They are talking as if they had been friends for many years.31. I don’t think it will rain this afternoon.32. Will you lend me the car next week?33. I won’t tell anybody what happened.34. We are not going to stay there long.35. I feel terrible. I think I’m going to be sick.。

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if引导的条件状语从句讲解和练习(答案)

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

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

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。