if条件句讲解练习

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。

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。

if条件句练习题及答案If条件句练习题及答案If条件句是英语语法中非常重要的一部分，它用来表达假设或条件。

以下是一些if条件句的练习题及答案，希望能帮助大家更好地掌握这一语法知识。

练习题一：用正确的if条件句填空。

1. If I __________ (have) enough money, I would buy a new car.2. If it __________ (rain) tomorrow, we will stay at home.3. If she __________ (study) harder, she would pass the exam.4. If he __________ (not be) late, we would have caught the train.答案：1. had2. rains3. studied4. had not been练习题二：选择正确的if条件句。

1. If I had studied harder, I __________ the exam.a) would have passedb) will passc) passd) passed2. If it rains tomorrow, we __________ our picnic.a) will cancelb) would cancelc) canceld) cancelled3. If you had told me earlier, I __________ helped you.a) willb) wouldc) would haved) had答案：1. a) would have passed2. a) will cancel3. c) would have练习题三：根据给定的情景写出合适的if条件句。

1. 你的朋友迟到了，你会怎么说？If you had left home earlier, you wouldn't have missed the bus.2. 你想和朋友一起去看电影，但天气可能会下雨，你会怎么说？ If it rains tomorrow, we will stay at home and watch a movie.3. 你没有通过考试，你会怎么安慰自己？If I had studied harder, I would have passed the exam.答案：1. If you had left home earlier, you wouldn't have missed the bus.2. If it rains tomorrow, we will stay at home and watch a movie.3. If I had studied harder, I would have passed the exam.希望以上练习题和答案能帮助大家更好地理解和掌握if条件句的用法。

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?。

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。

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。

初中英语――条件状语从句（解说 & 练习）Ⅰ条件状语从句的定义Ⅱ条件状语从句的指引词指引的条件状语从句表示在某种条件下某事很可能发生。

If we pay much attention to the earth, we'll have a better world.假如我们多关爱地球，就会拥有一个更美好的世界If it rains tomorrow, what shall we do?假如明日下雨，我们怎么办？注意：if 还能够指引虚构条件句，表示不行实现的条件，从句中多用一般过去时或过去达成时。

What would happen if there were no water ?假如没有水会如何？指引的条件状语从句unless 的意思是假如不，除非。

可与 if...not 交换。

You will fail in English unless you work hard.你英语考试会不及格的，除非你更为努力。

/so long as 指引的条件状语从句as /so long as意思是“只需”So long as you're happy,i will be happy.只需你快乐，我就快乐。

Ⅲ条件状语从句的种类Ⅳ条条件句从句主句件状语从一般未来时句的真切一般此刻时神态动词+动原时态原则祈使句一般过去时would/could+ 动原非真切be 动词用（were）注意：学习" if " 指引的条件状语从句的用法 ,此刻总结一下 :if 条件句不一般 ,几个重点记心间 ;条件句 ,放在前 , 逗号要放句中间。

条件句表真切，主将从现要遵照；条件句非真切，虚构语气用到位。

练习Ⅰ.单项选择（） you _____ to the party, you ’ll have a great time.A. will goB. wentC. goD. going（）2. I ____ her the answer if she ____me.A. can tell, will askB. will tell, will askC. would tell, askD. will tell, asks（）3. –What are you going to do tomorrow?--We’ll go to the library tomorrow if it ___.A. isn ’t rainB. rainC. won ’t rainD. doesn ’t rain（）4. What will you do if you _____ to the o ld folk ’s home?A. goB. wentC. goingD. will go（）5．I ’ll give the book to him if he ___ here next Sunday.A. will comeB. comesC. is comingD. cameⅡ.用所给词的适合形式填空6..If you ________(feel) tired, you _______________ (have) to have a rest.7. Where _______ he _________(see) the film if he ________________(have) time?8. If there __________(be) fewer trees, there _______________( be) more pollution.9. If Marcia _____________(live) alone, she ___________________( keep) a pet parrot.11. Lana ________________( buy) a new dress if the old one ____________(be) out of style.twins ______________(fight) if they_______________(argue).13. I ____________(have) a bake sale if I _____________(need) money for education.14. Peter _____________( send) me a beautiful souvenir if he ________________(tour) Spain.15. I ____________(go) to the beach if it________________ ( not rain) this week.17. __________they __________( have) a match if the . teacher _____________(be) busy?18. If she ____________(get) up late, she _____________ ( not catch) the early bus. Ⅲ.翻译以下句子19..假如他到的晚了会发生什么事情？What _______________ if he _____________ late?20. 假如努力学习，你就会获得好成绩。