If条件状从句练习
if引导的条件状语从句-与专题练习
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。
如：If you ask me ,I will answer you．If it rains tomorrow, I will stay at home.I will stay at home if it rains tomorrow.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 in university，I would …．If I had enough money ,I would buy a car.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．2.if从句用一般现在时，主句用may/might/can/mustIf the fog gets thicker the plane may/might be diverted.3.if从句用一般现在时，主句用一般现在时If you heat ice it turns to water. (也可用will turn)4. 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.5.if从句用现在完成时，主句用一般将来时If you have finished dinner I’ll ask the waiter for the bill.一、用所给词的适当形式填空1.If you ________(feel) tired, you _______________ (have) to have a rest.3. If there __________(be) fewer trees, there _______________( be) more pollution.5. If Marcia _____________(live) alone, she ___________________( keep) a pet parrot.6. Lana ________________( buy) a new dress if the old one ____________(be) out of style.9. Peter _____________( send) me a beautiful souvenir if he ________________(tour) Spain.10. If Mr Green ___________(say) I am hard- working, my parents _________( feel) glad.11.I ____________(go) to the beach if it________________ ( not rain) this week.13.He ____(write) a letter to his grandparents if he ____(get) his report card this week.14. If she ____________(get) up late, she _____________ ( not catch) the early bus.15. Peter ________(major) in English if he ____(pass) the exams in Peking University.16. 如果努力学习，你就会取得好成绩。
(完整版)if引导的条件状语从句练习题
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。
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. 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。
if引导的条件状语从句的时态练习
If引导的条件状语从句的时态练习一、在正确的答案下划一条线。
1 Daina （will go/go/goes）to Europe if she （will pass/pass/passes）the exams 。
2. The graduates (will teach/teach/teaches）in the poor village if the Ministry of Education （will agree/ agree/agrees) soon。
3。
If there (will be/ are/is）a car accident，they (will call/call/calls）110 for help at once. 4. If it (won’t/don’t/doesn’t/ isn’t) rainy，we (will take/ take/takes）walk outside。
5。
If a UFO (will land/land/lands）in front of me，I (will go/go/goes）in to look for the alien.6. If he （will have/have/has) money，he (will bulid/build/builds) a science lab.7。
Don’t wait for me if I (am/ will be）late.8.They （won’t/don’t) go to the beach if it （will rain/rain /rains）.9。
I （will call/ call) you if he (will stay/stay /stays）at home.10。
Mr Smith （will let/ let/lets) you know if he (will need/ need/ needs) help。
（完整版）if条件状语从句练习与答案
（完整版）if条件状语从句练习与答案if_条件状语从句的时态练习及答案_初中习题集I.单项选择1.If you to the party, you’ll have a great time.a.will gob. wentc. god. going2.It will be a long time peter his work.a.since, has finishedb. after, finishesc. when, will finishd. before, finishes.3.what will father us from Japan?a.takeb. bringc. carryd. make4.Weifang is famous kitesa.forb. toc. ond. with5.I her the answer if she me.a. can tell, will askb. will tell, will askc. would tell, askd. will tell, asks6.– 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 7.—Do you know when he will come back tomorrow?--sorry, I don’t know. when he back, I’ll tell you.a. comesb. will comec. comed. may come8.what will you do if you to the old folk’s home visit?a.gob. wentc. goingd. will go9.If I eat food, I’ll be very fat.a.too manyb. many tooc. too muchd. much too10.I’ll give the book to him if he here next sunday.a. will comeb. comesc. is comingd. came11. There an english film in our school tomorrow.a. is going to haveb. will havec. is going to bed. has12.Could you tell us where ？a.will the next olympic games heldb.the next olympic games will be heldc.would the next olympic games be heldd.the next olympic games would be held13.When my mother returned last night,I a book.a. readb. am readingc. was readingd. am going to read14.What you when it began to rain?a. do, dob. were, doingc. are, doingd. did, do15.I’ll wake you up when he back.a. willb. is going to comec. comesd. comeII、用所给词的适当形式填空1.If you (feel) tired, you (have) to have a rest.2.Where he (see) the film if he (have) time?3.If there (be) fewer trees, there (be) more pollution.4.He (dress) more casually if he (not work) on weekends.5.If marcia (live) alone, she (keep) a pet parrot./doc/d011234800.html,na (buy) a new dress if the old one (be) out of style.7.The twins (fight) if they (argue).8.I (have) a bake sale if I (need) money for education.9.Peter (send) me a beautiful souvenir if he (tour) spain.10.I f mr. green (say) I am hard- working, my parents (feel) glad.11.I (go) to the beach if it (not rain) this week.12.they (have) a match if the p.e. teacher (be) busy?13.He (write) a letter to his grandparents if he (get) his report card this week.14.If she (get) up late, she (not catch) the early bus.15.Peter (major) in English if he (pass) the exams in peking university.III. 完成句子1.如果他到的晚了会发生什么事情？What if he late?2.如果努力学习，你就会取得好成绩。
完整版)if条件状语从句练习及答案
完整版)if条件状语从句练习及答案I。
单项选择1.If you go to the party。
you'll have a great time.2.It will be a long time before Peter finishes his work.3.What will XXX?4.XXX.5.I will tell her the answer if she asks me.6.We'll go to the library tomorrow if it doesn't rain.7.Sorry。
I don't know。
When he comes back。
I'll tell you.8.What will you do if you go to the old folk's home visit?9.If I eat too much food。
I'll be very fat.解析：本文没有明显的段落错误，只有格式错误。
需要将每个问题和选项分开，使用标点符号进行分隔。
同时，将错误的单词或语法进行修改，使其符合语法规则。
1.I'll give the book to him if he comes here next Sunday.2.There is going to be an English film in our school tomorrow.3.Could you tell us where the next Olympic Games will be held?4.When my mother returned last night。
I was reading a book.5.What were you doing when it began to rain?6.I'll wake you up when he comes back.1.If you feel tired。
if条件状语从句练习题及答案
if条件状语从句练习题及答案If条件状语从句练习题及答案条件状语从句是英语中常用的一种从句结构，用来表示某个条件成立时，另一个事件或结果也将发生。
掌握条件状语从句的用法对于提高英语口语和写作能力非常重要。
下面将给出一些条件状语从句的练习题及答案，帮助读者更好地理解和掌握这一语法知识。
练习题一：1. If it rains tomorrow, ___________.2. She will be late for work if ___________.3. If I see him, ___________.4. If you don't study hard, ___________.5. If I were you, ___________.练习题二：1. If you ___________ to the party, please bring a gift.2. If I ___________ you, I would apologize.3. If she ___________ the exam, she will be very happy.4. If it ___________ tomorrow, we will go hiking.5. If he ___________ the bus, he will be late for the meeting.答案一：1. we will stay at home.2. she misses the bus.3. I will say hello.4. you will fail the test.5. I would study harder.答案二：1. come2. were3. passes4. doesn't rain5. misses通过以上练习题，我们可以发现条件状语从句的用法和特点。
首先，在条件状语从句中，通常使用的连词有if、unless、provided that等。
if条件状语从句练习题及答案
if条件状语从句练习题及答案If条件状语从句练习题及答案If条件状语从句是英语中常见的一种句型，用来表达假设、条件或可能性。
下面是一些if条件状语从句的练习题及答案，希望对大家的学习有所帮助。
练习题：1. If it rains tomorrow, what will you do?A. I will go for a walk.B. I will stay at home.C. I will go to the beach.2. If I had more time, I _____ visit my grandparents.A. willB. wouldC. can3. If she _____ harder, she would pass the exam.A. will studyB. studiedC. studies4. If he _____ the train, he would have been late for work.A. missedB. missesC. will miss5. If you _____ me, what would you do?A. amB. wereC. will be答案：1. B. I will stay at home.2. B. would3. B. studied4. A. missed5. B. were以上是关于if条件状语从句的练习题及答案，希望大家能够通过练习加深对这一句型的理解，提高自己的英语水平。
同时也希望大家能够在日常生活中多加练习，提高自己的语言表达能力。
if引导的条件状语从句练习题
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 he runs, he’ll get there in time. 如果他用跑的，他就会及时赶到那儿。
If it is sunny tomorrow,we will have a sports meeting.如果明天天气放晴,我们就会举办运动会。
If it is summer now ,we can go swimming everyday.如果现在时夏天，我们就可以每天去游泳了。
If it stops snowing，we can go out. 如果雪停了，我们就可以出去。
If we don't do something now, they may all disappear forever!如果我们现在不做什么，他们可能永远消失!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。
4．if从句用一般现在时，主句用一般现在时。
If you heat ice it turns to water. 如果把冰加热，它就会化成水。
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6．if从句用现在完成时，主句用一般将来时If you have finished dinner I’ll ask the waiter for the bill. 如果你吃完了，我就叫服务生来算账If条件状从句练习( )1.If you _____ to the party, you’ll have a great timeA. will goB. wentC. goD. going( )2.–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( )3. What will you do if you _____ to London?A. goB. wentC. goingD. will go( )4. If I eat too much food, I____ very fat.A. wasB. will beC. beD. am( )5. I’ll give the book to him if he ___ here next Sunday.A. will comeB. comesC. is comingD. came( )6. I ____ her the answer if she ____me.A. can tell, will askB. will tell, will askC. would tell, askD. will tell, asks( )7. We’ll go to the farm if it ____ tomorrow.A. won’t rainB. will be rainyC. doesn’t rainD. isn’t raining( )8. There is going to _______ a sports meeting next week. If it ________, we’ll have to cancel it. A. be, will rain B. have, will rain C. be, rains D.has,rains( )9. Your teacher will be unhappy if you _______ to school late.A. comeB. will comeC. are comingD. came( )10. If he _______ , please let me know.A. comesB. will comeC. comingD. came参考答案：1-5 CDABB 6-10 DCCAA二、用所给词的适当形式填空。
(完整word版)if引导的条件状语从句讲解和练习(答案)
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专练
If 引导的条件状语从句专练学号: ________ 班级：_________ 姓名：___________ 一．单项选择1.Your teacher will be unhappy if you ____ to school late.A. comeB. will comeC. are comingD. came2. I don’t know if he _______. If he _____, please let me know.A. come; comesB. will come; will comeC. will come; comesD. comes; will come3. If he _____harder, he will catch up with me soon.A. studyB. studiesC. studyingD. to study4. Don’t go to Beijing if it ______ tomorrow.A. will rainB. won’t rainC. rainsD. doesn’t rain5. If I finish _______ my homework, I ______TV.A. do, watchB. to do, will watchC. to do, watchD. doing, will watch6. If he _____his father, his father _____A. tells, is angryB. tells, will be angryC. tell, is angryD. will tell, is angry7. —I wonder if it is going to rain next week.—If it _______, I have to stay at home.A. isB. doesC. doD. will8. Remember to call me ___ you have any trouble.A. beforeB. ifC. untilD. where9. You must stop _____ the policeman says “stop”.A. thatB. ifC. thenD. until10. Linda’s mother ____if she ____her work this week.A. comes back, finishesB. comes back, will finishC. will come back, finishesD. will come back, will finish11. Frank ____ to see his teacher if he ______ free tomorrow.A. will come, will beB. comes, isC. will come, isD. comes, will be12. Write down the phone number, ____ you’ll forget it.A. soB. andC. butD. or13. Stop smoking, ______you’ll get better soon.A. andB. orC. butD. after14. I’m waiting for my friend. ______, I will go shopping alone.A. If she comesB. If she doesn’t comeC. If she won’t comeD. If she will come15. You’ll be late ____ you don’t get up now.A. ifB. beforeC. untilD. after16. —Tony, do you know if Frank ______ to the theatre with us this Sunday if it _____?—Sorry, I have no idea.A. will go, is fineB. goes, is fineC. will go, is going to be fineD. goes, will be fine17. I don’t know if my parents ____us. If they ____us, we’ll go climbing.A. will agree with; agree withB. agree to; agreeC. agree with; agree withD. agree to; agree to18. Hurry up, ______ you’ll be late for school.A. andB. orC. soD. but19. ________cross the road if the traffic lights are red.A. Won’tB. Don’tC. Can’tD. Doesn’t20. You’ll be late again ____you hurry.A. ifB. whetherC. unlessD. as long as21. If it ______ tomorrow, we _____ build a snowman.A. snows, willB. snow, won’tC. will snow, willD. won’t snow, will22. In Britain, you must be 18 ______ you want to drive a car.A. whyB. becauseC. soD. if二．句型转换1.If you get up late, you will miss the school bus. (同义句)If you _______ get up early, you won’t ______the school bus.2.If you can work hard, you will pass the exam.If you __________ work hard, you ________fail the exam.3.If I have time this weekend, I will go to the park.___________ ________ you _______ if you have time this weekend?4.Put on your coat, or you’ll catch a cold.If you _______ put on your coat, you ______ catch a cold.5.We can’t live without any water.We can’t live ______ we ____________have any water.6.Think hard and then you’ll find a better way._________ ________ think hard, you’ll find a better way.7.If you aren’t careful, you will fall and hurt yourself._______ _________, __________ you will fall and hurt yourself.8.If you work hard, you will be successful.Work hard ________ you __________successful.三．改错1.If you know the answer, not ask others. （）________A B C2.Eat breakfast, and you will be hungry. ( ) _________A B C3.Turning on the TV if you want to watch the news. ( ) _________A B C4.If your mother meet him, please let me know. ( ) ________A B C四．适当形式填空1.If the camera __________(not start), ______________(press) the blue button.2.If Tom _____________(come) here, I ________________(not join) in the party.3.If the weather _________________(not be) fine, Miss Li _________(not do ) theshopping.4.If it _________(be) sunny tomorrow, I __________(go) to school on foot.5.If she _____________(arrive) this afternoon, she __________(call) you.。
if引导的条件状语从句练习题
if引导的条件状语从句练习题条件状语从句是英语中非常重要的语法结构，它用来表达一个动作或状态的发生依赖于另一个条件的成立。
以下是一些练习题，帮助学生更好地理解和运用if引导的条件状语从句。
1. 填空题：- 如果明天下雨，我们就会取消野餐。
(If it ______ tomorrow, we will ______ the picnic.)2. 改错题：- 如果你努力学习，你会通过考试。
(If you study hard, you will pass the exam.) (正确)3. 翻译题：- 如果你明天有空，我们可以一起去看电影。
(If you are free tomorrow, we can go to the movies together.)4. 选择题：- I will go to the party if I ______ my work before 5 p.m.A) finishB) finishedC) will finishD) have finished5. 连词成句：- If / you / a ticket / buy / will / you / the concert / attend.(If you buy a ticket, you will attend the concert.)6. 完形填空：- I promise to help you with your homework ______ you ask me.A) ifB) unlessC) untilD) because7. 转换句子：- He will go to the beach if the weather is good.- The weather must be good for him to go to the beach.8. 情景对话填空：- A: What will you do if you win the lottery?B: If I win the lottery, I ______ travel around the world.(A) will(B) would(C) am going to(D) have been going to9. 写作练习：- 写一段对话，其中包含至少两个if引导的条件状语从句。
if条件状语从句练习及答案
if_条件状语从句的时态练习及答案_初中习题集I.单项选择1.I.yo.____.t.th.party.you’l.hav..grea.time.a.wil.go.b.went.c.go .d.going2.I.wil.b..lon.tim.___.pete.____.hi.work.a.since.ha.finished .b.after.finishesc.when.wil.finish .d.before.finishes.3.wha.wil.fathe.____.u.fro.Japan.a.take .b.bring .c.carry .d.mak.4.Weifan.i.famou._____.kitesa.for .b.to .c.on .d.with5.I___.he.th.answe.i.sh.____me.a.ca.tell.wil.ask .b.wil.tell.wil.ask.c.woul.tell.ask .d.wil.tell.asks6..wha.ar.yo.goin.t.d.tomorrow?--we’l.g.t.th.librar.tomorro.i.i.___.a.isn’.rain.b.rain .c.won’.rain.d.doesn’.rain7.—Do you know when he will come back tomorrow?--sorry..don’.know.whe.h.___.back.I’l.tel.you.es.e .e ..8.wha.wil.yo.d.i.yo.____.t.th.ol.folk’.hom.visit?a.go .b.went .c.going .d.wil.go9.I..ea.___.food.I’l.b.ver.fat.a.to.many .b.man.too .c.to.much.d.muc.too10.I’ll give the book to him if he ___ here next sunday.e .es .ing .d.came11.Ther.____a.englis.fil.i.ou.schoo.tomorrow.a.i.goin.t.have.b.wil.have .c.i.goin.t.be .d.has12.Could you tell us where ____？a.wil.th.nex.olympi.game.held.b.th.nex.olympi.game.wil.b.heldc.woul.th.nex.olympi.game.b.hel.d.th.nex.olympi.game.woul.b.helds.night,.____..book.a.read .b.a.reading .c.wa.reading.d.a.goin.t.read14.Wha.___.yo.___.whe.i.bega.t.rain?a.do.d..b.were.doing.c.are.doing.d.did.do15.I’l.wak.yo.u.whe.h.____back.a.will .e .e.eII、用所给词的适当形式填空1.I.yo._______(feel.tired.yo.______(have.t.hav..rest.2.Wher.____.h. ______(see.th.fil.i.h.________(have.time?3.I.ther.___.(be.fewe.trees.ther.______.(be.mor.pollution.4.H.____.(dress) mor.casuall.i.h.______.(no.work.o.weekends.5.If marcia _______ (live) alone, she _______ (keep) a pet parrot.n.____.(buy..ne.dres.i.th.ol.on.___.(be.ou.o.style.7.Th.twin.____.(fight.i.they_________.(argue).8.I_____.(have..bak.sal.i.I___.(cation.9.Pete.___.(send.m..beautifu.souveni.i.h.____(tour.spain.10.I.mr.gree.______.(say..a.hard.working.m.parent.____.(feel.glad.11.I_____.(go.t.th.beac.i.it_______.(no.rain.thi.week.12.____the._____.(have..matc.i.th.p.e.teache.______.(be.busy?13.H.______.(write..lette.t.hi.grandparent.i.h._____.(get.hi.repor.car.thi.week.14.I.sh._____.(te.sh.____.(no.catch.th.earl.bus.15.Pete.________.(major.i.Englis.i.h._______(pass.th.exam.i.peking.university.III.完成句子1.如果他到的晚了会发生什么事情？What _______________ if he _____________ late?2.如果努力学习, 你就会取得好成绩。
if引导的条件状语从句练习题
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。
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. 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。
4．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 upstair s. 如果你是在找彼得，上楼就会找到他5．if从句用现在完成时，主句用一般将来时If you have finished dinner I’ll ask the waiter for the bill. 如果你吃完了，我就叫服务生来算账If条件状从句练习（）1.If you _____ to the party, you’ll have a great timeA. will goB. wentC. goD. going（）2.–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（）3. What will you do if you _____ to the old folk’s home visit? A. go B. went C. going D. will go（）4. If I eat ____ food, I’ll be very fat. A. too many B. many too C. too much D. much too（）5. I’ll give the book to him if he ___ here next Sunday.A. will comeB. comesC. is comingD. came（）6. I ____ her the answer if she ____me.A. can tell, will askB. will tell, will askC. would tell, askD. will tell, asks7. We’ll go to the farm and help the farmers with the apple-picking if it ____ tomorrow.A. won’t rainB. will be rainyC. doesn’t rainD. isn’t raining8. There is going to _______ a sport s meeting next week. If it ________, we’ll have to cancel it.A. be, will rainB. have, will rainC. be, rains9. Your teacher will be unhappy if you _______ to school late.A. comeB. will comeC. are comingD. came10．I don’t know if he __. If he __ , please let me know.A. comes, comesB. will come, will comeC. will come, comesD. comes, will come二、用所给词的适当形式填空。
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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。
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. 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。
4．if从句用一般现在时，主句用一般现在时If you heat ice it turns to water. (也可用will turn)如果把冰加热，它就会化成水。
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。
6．if从句用现在完成时，主句用一般将来时If you have finished dinner I’ll ask the waiter for the bill. 如果你吃完了，我就叫服务生来算账注意：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。
条件句表可能，主句多用将来时；条件句表事实，主句常用现在时。
在if 引导的条件状语从句中，如果从句谈论的是一个有可能发生的事实及其产生的相关的结果，主句用一般将来时态，从句用一般现在时态。
如：We can walk there if we can't find a bus .If it rains tomorrow ,we will not go to the zoo.What will you do if you find a panda in danger.如果if 条件句谈论的是重复发生和预示要发生的情景和事件，则主从句大多用一般现在时态。
如：If bears are in danger ,they attack people.在if 引导的条件状语从句中，if 和条件句位置灵活，可直接放在主句后面，若if 条件句放句首，从句后面要加逗号，和主句隔开。
还要注意前后时态一致原则If条件状从句练习（）1.If you _____ to the party, you’ll have a great timeA. will goB. wentC. goD. going（）2.–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（）3. What will you do if you _____ to the old folk’s home visit?A. goB. wentC. goingD. will go（）4. If I eat ____ food, I’ll be very fat.A. too manyB. many tooC. too muchD. much too（）5. I’ll give the book to him if he ___ here next Sunday.A. will comeB. comesC. is comingD. came（）6. I ____ her the answer if she ____me.A. can tell, will askB. will tell, will askC. would tell, askD. will tell, asks7. We’ll go to the farm and help the farmers with the apple-picking if it ______ tomorrow.A. won’t rainB. will be rainyC. doesn’t rainD. isn’t raining8. There is going to _______ a sports meeting next week. If it ________, we’ll have to cancel it.A. be, will rainB. have, will rainC. be, rains9. Your teacher will be unhappy if you _______ to school late.A. comeB. will comeC. are comingD. came10．I don’t know if he ______. If he _______ , please let me know.A. comes, comesB. will come, will comeC. will come, comesD. comes, will come 11．You will stay healthy _______ you do more exercise, such as running and walking.A. ifB. howC. beforeD. where12.If she _______ here tomorrow, I will tell you.A. comesB. will comeC. comeD. came13. I’m waiting for my friend.__________, I’ll go shopping alone.A. If she comesB. If she doesn’t comeC. If she won’t come14. —Tom wants to know if you will have a picnic tomorrow. —Yes. But if it ______, we’ll play chess instead.A. will rainB. rainedC. is rainingD. rains15. If Tom _____ the game, we'll give him a surprise".A. winB. winsC. wonD. miming16. If there _______ no buying and selling of animals, there ______ no killing in nature.A. is; will heB. will be; will beC. is; isD. will be; is17. Fm waiting for my friend.________, I'll go shopping alone.A. If she comesB. If she won't comeC. If she doesn't come18.The students ____ have a sports meeting this weekend if it _____。
A. won’t; rainsB. will; rainsC. won’t; will rainD. are going to; is going to rain19. What will you do if you _____ to the old folk’s home visit?A. goB. wentC.goingD. will go答案1.c2.d3.a4.c5.b6.d7.d8.c9.a 10.c 11.a 12. a 13b 14.d 15.b 16.a 17.c 18.a 19a三．完成句子。
1.如果他到的晚了会发生什么事情？What ______ _____ if he ____ late?2. 如果努力学习，你就会取得好成绩。
If you______ _______, you _____ ____good _______.3. 他如果看电视太久了，他的父母会不高兴。
If he _____ TV too much, his parents _____ _________unhappy.4. 如果我们为他组织生日聚会，大家都会来的。
Everyone _____ _____ if we _______a birthday party ________ him.5.如果明天不下雨，我会和你一起去公园的。
If it _____ ______tomorrow, I _____ go to the park ______you.6. 如果她睡过头了，就会旅游迟到的。
he____ ___ ___ ___ the trip if she _____7. 如果他有空，他会帮助你的。