If 引导的条件状语从句讲解与练习.doc培训讲学

if引导的条件状语从句精讲与专题练习初中英语――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。

If you have finished the homework，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 would invite him to the party．如果我是你，我会邀请他参加聚会。

I would have arrived much earlier if I had not been caught in the traffic．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从句用普通目前时，主句用普通将来时If he runshe’ll get there in time.如果他用跑的，他就会及时赶到那儿。

The cat will scratch 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 thicker the plane may/might be diverted.假如雾在大一些，飞机可能就会改在此外机场下降。

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

if引导的条件状语从句[课本链接]If you do, you’ll be sorry. (Unit 5, Section A)[定义] :if引导的条件状语从句表示假如从句的动作发生，主句的动作就（不）会发生。

[句子结构]if 引导的条件状语从句位置灵活，可直接放在主句后面，也可以放在句首。

放在句首时，从句后面要用逗号和主句隔开。

如：I’ll go to see you if I have time. 如果有时间，我就去看你。

If it rains tomorrow, we’ll sta y at home. 如果明天下雨，我们就呆在家里。

[时态呼应]在复合句中：⑴当主句是一般现在时或是一般将来时时；（2）当主句是祈使句时；（3）当主句含有情态动词时，if引导的条件状语从句通常用一般现在时。

如：If she doesn’t come, she will be sorry. 如果她不来，她会遗憾的。

Have a good rest if you are tired. 如果累了，你就好好休息一下。

We must study hard if we want to pass the final exam. 如果想通过期末考试，我们必须努力学习。

[同义句转换]1. 用“祈使句＋and / or ＋一般将来时的句子”转换。

如：If you work hard, you’ll pass the exam easily. → Work hard, and you’ll pass the exam easily.努力学习，你将很容易通过考试。

If you don’t hurry up, you’ll miss the train. → Hurry up, or you’ll miss the train.快点儿，否则你就赶不上火车了。

2. 用含介词with或without的介词短语转换。

如：If there is no water, fish can’t live. → Fish can’t live without water. 离开水，鱼不能生存。

If引导的条件状语从句讲解与练习If引导条件状语从句的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。

女口：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 finished the homework you can go home 如果你作业做完了就可以回家了。

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。

The cat will scratch 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/can/must/shouldIf it stops snowing we can go out如果雪停了，我们就可以出去。

If you want to lose weight you must/should eat less bread ・如果你想减肥，你必须少吃面包。

（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。

女口：If I were you , I would invite him to the party.如果我是你，我会邀请他参加聚会。

I would have arrived much earlier if I had not been caught in the traffic 要不是交通堵塞，我本会来得早一些。

）If条件状语从句练习( )1. If I find his phone number, I _____ you.A. tellB. toldC. will tellD. have told()2. I __ the CDs to you if I have time tomorrow.A. will returnB. returnedC. have returnedD. return( )3. The students will go to the Summer Palace if it _______ tomorrow.A. won' t rainB. isn' t rainingC. doesn' t rainD. isn' t rain( )4. I won ' t watch the TV play if myhar ___ me do my homework.A. letB. will letC. won' t letD. lets()5. If you ____ q uiet, I ' ll tell you what happened.A. willB. are C are to be D be()6. If you go to the party, you ____ a good time.A. would haveB. haveC. will haveD. had( )7. Don ' t worry. Peter will call you as soon as he _____ London.A. will get toB. gets toC. get toD. got to( )8.He doesn ' t tell me when he __.I ' ll telephone you as soon as heA. will come, comesB. will come, will comeC. comes, will comeD. comes, comes()9.-- I don ' t know if Dr. White _______ to the party next week.--I think he will come if he ______ free.A. comes; will comeB. will come; will beC. comes; isD. will come; is( )10. I don' know if there ______ a sports meeting next month .If they____ i t, I must get ready for it.A. is; will holdB. will be; holdC. will be; will holdD. will have; holdA. what does he like bestB. what he like bestC. what he does like bestD. what he likes best ()2. Can you tell me ______________________ ?宾语从句练习()1. I don ' t know ______________A. where she lives B・ where does she liveC. she lives whereD. where she live( )3. He asked me _______________________________ .A. what time is itB. what time it isC. what time was itD. what time it was ()4. Do you know ?A. how much did it costB. how much it did costC. how much it costsD. how much does it cost( )5. The man asked her _______________________ .A. why did she do itB. why she did itC. why she doesD. why does she do it( )6. Nobody knows _________________________ .A. when will she come backB. when she come backC. when she will come backD. when does she come back ( )7. Mum asked ___________________________________________ .A. where he wasB. where was heC. where he isD. where is he( )8. Do you know _______________________________ ?A. what they are looking forB. what are they looking forC, they are looking for what D. what do they look for ()9. The teacher asked __________________________________________________ .A. who can answer this questionB. who could answer the questionC. what question did she askD. she answered this question( )10. I asked her _______________________________ .A. whether he has been to AustraliaB. whether has he been to AustraliaC. whether he had been to AustraliaD. whether he goes to Australia( )11. The teacher told us _________________________________ .A. that light traveled faster than soundB. if light traveled faster than sound ・C. that light travels faster than soundD. if light travels faster than sound( )12. He said that __________________________________ .A. he is doing his homeworkB. he does his homeworkC. he was doing his homeworkD. he do his homework( )13. I asked him _________________________ .A. where did he goB. where he wentC. where does he goD. where he did go( )14. --Excuse me, could you tell me _____ get to the plane?--Certainl y. Go straight alone here.A. how can weB. how we canC. when can weD. when we can( )15. Do you know _____ he will ride here at 8 tomorrow morning?A. whenB. whereC. whetherD. how( )16. --Can you tell me why __________________ ?--Because I want to help the people there.A. do you go to TibetB. did you go to TibetC. are you going to TibetD. you are going to Tibet( )17. Do you know _______________________________ ?A. what time does the train leaveB. what time leaves the trainC. what time the train leaveD. what time the train leaves( )18. Could you tell me _______________________ ?A. who is heB. where ' s the nearest restaurantC. if he will come tomorrowD. which way is to the underground station( )19 ・--Do you know _________ ?--Sorry・ I don ' t know・ You may ask the woman over there. A.when the shop opens B. when is the shop openC. when does the shop openD. when will the shop open( )20 --Dad, do you know ____________ ? --In half an hour.A. when will the football game startB when the football game will startC. when is the football game going to startD. when shall we start the football game( )21. Could you tell me _______________________ ?A. which bus they are waiting forB. which bus are they waiting forC. they ' re waiting for which busD. which bus they wait( )22. I asked her __________________________ .A. whether did she like the red oneB. whether she likes the red oneC. whether does she like the red oneD. whether she liked the red one( )23. Can you guess 猜) ___________ the people in the picture are ?A. whenB. whomC. whoseD. who( )24. I ' m thinking about _________________________________ .A. if I ' ll help heB. whether I ' ll help herC. what I ' ll help herD. that I help her( )25. --We never know ______________ . --They say he is a teacher.A. what the old man isB. what is the old manC. who is the old manD. which the old man is汪树峰蔡英凯学生缴费日期表。

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。

(完整word)八年级条件状语从句讲练(附答案)引导条件状语从句的连接词主要有：if(如果）、unless （除非）或as long as（只要）等。

unless在意思上等于if...not。

一、条件状语从句用法1、引导条件状语从句最常用的连词是if,由if引导的条件状语从句表示在某种条件下某事很可能发生。

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。

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。

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

2、unless = if...not.除非,若不,除非在……的时候例如：Let's go out for a walk unless you are too tired.=If you are not too tired, let's go out for a walk.Unless it rains, the game will be played.除非下雨,比赛将照常进行。

3、so/as long as只要例句;You may borrow my book as long as you keep it clean.只要你保持干净，你可以借我的书。

So long as you’re happy, it doesn’t matter what you do.只要你高兴，你做什么都没有关系。

二、时态问题在条件状语从句中，要注意“主将从现”的规定，即主句用一般将来时，从句用一般现在时表示将来时。

例句：I will come to see you if I have time.我有时间，我就来看你。

if引导的条件状语从句（一）定义if引导的句子在复合句中表示条件，假如if从句的动作发生，主句的动作就（不）会发生，因此称为条件状语从句。

（二）位置if 引导的条件状语从句位置灵活，可直接放在主句后面，也可以放在句首。

放在句首时，从句后面要用逗号和主句隔开。

① If I have enough money, I will travel around the world.② I will travel around the world if I have enough money.（三）用法① Work hard, and you’ll pass the exam easily. 努力学习，你将很容易通过考试。

→If you work hard, you’ll pass the exam easily.② Hurry up, or you’ll miss the train. 快点儿，否则你就赶不上火车了。

→If you don’t hurry up, you’ll miss the train.（3）当主句含有情态动词时，if引导的条件状语从句通常用一般现在时。

We must study hard if we want to pass the final exam.如果想通过期末考试，我们必须努力学习。

（4）用含介词with或without的介词短语转换。

① If you help me, I'll finish my job soon.→With your help, I'll finish my job soon. 如果你帮我，我将很快完成我的工作。

② If there is no wate r, fish can’t live.→ Fish can’t live without water. 离开水，鱼不能生存。

（四）if引导的条件状语从句与if引导的宾语从句的区别if引导宾语从句时表示“是否”，位于及物动词之后；if引导的条件状语从句时表示“假如，如果”，位于句首或句中。

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引导的条件状语从句的讲解与练习一、if从句的位置if引导的从句可以放在主句之前，也可以放在主句之后。

Eg: If you do not feel well, go to see the doctor.Go to see the doctor if you do not feel well.二、if从句的类型：1.if从句+祈使句(表建议: 如果......就......)主祈从现Eg: If you want to go to the cinema, call me.2.if从句，主语+will(not) +V.(动词原形)主将从现Eg: If you start now, you'll finish it before dinner.If it is sunny tomorrow, we will go for a picnic.3.if从句，主语+may(might)/could+V.(动词原形)主情从现Eg: If you work hard, you might not make so many mistakes.即学即练一、单项选择。

1.If you _____ to the party, you’ll have a great timeA. will goB. wentC. go2. I ____ her the answer if she ____me.A. can tell, will askB. will tell, will askC. would tell, askD. will tell, asks3 – What are you going to do tomorrow? —We’ll go to the library tomorrowif it ___.A.isn’t rainB. rainC. won’t rainD. doesn’t rain4. What will you do if you _____ to the old folk’s home visit?A. goB. went D. will go5. If I eat ____ food, I’ll be very fat.A. too manyB. many tooC. too muchD. much too6. I’ll give the book to him if he ___ here next Sunday.A. will eB. esC. is ingD. Came7. Our world will get better and better each of us lives a greener life.A. beforeB. ifC. thoughD. until8. If he ________hard, he will get good gradesA. studyB. studiesC. will studyD. studied9. I want to know if Mary________ to the party tomorrow.A. goB. wentC. will goD. goes10. Everyone must dress up. If you_______ ,they won’t let you in.A. don’tB. won’tC. can’tD. mus tn’t11. Johnson won't answer the phone if he _______ the number.A. knewB. doesn't knowC. will knowD. didn’t know12. If Nancy_____the exam, she will go to Australia for English study.A. passB. passedC. passesD.will pass13. There will be less pollution more people use publictransportation.A.butB.thoughC.unlessD. if二、用所给词的适当形式填空。

初中英语――条件状语从句（讲解&练习）Ⅰ条件状语从句的定义Ⅱ条件状语从句的引导词1.if引导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.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？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。

可与if...not互换。

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

3.as /so long as引导的条件状语从句as /so long as意思是“只要”So long as you're happy,i will be happy.只要你高兴，我就高兴。

Ⅲ条件状语从句的种类Ⅳ条件状语从句的时态原则注意：学习" if " 引导的条件状语从句的用法,现在总结一下: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。

练习Ⅰ.单项选择（）1.If 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 old 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.用所给词的适当形式填空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.12.The 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 P.E. teacher _____________(be) busy?18. If she ____________(get) up late, she _____________ ( not catch) the early bus.Ⅲ.翻译下列句子19..如果他到的晚了会发生什么事情？What _______________ if he _____________ late?20. 如果努力学习，你就会取得好成绩。

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初中英语――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。

If you have finished the homework, 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 would invite him to the party．如果我是你，我会邀请他参加聚会。

I would have arrived much earlier if I had not been caught in the traffic．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’ll get there in time. 如果他用跑的,他就会及时赶到那儿。