if引导的条件状语从句讲解和练习(答案).pdf
条件状语从句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.女口果明天下雨，我们就不去公园了。Uni ess 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 pare nts will be pleased with our performa nee 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 pare nts will be pleased with our performa nee_we try our best.2、如果人人为保护环境做出奉献，世界将会变得更美好。_ to proteeti ngthe environment,the world will become much more beautiful.二、if 引导的条件状语从句1“i 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 gree n light is n ton,wait for a minute.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 引导的否认条件状语从句，而且主语是第二人称。例如：Study hard andyou 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(2022 重庆中考)Work hard，_you may eateh up with your classmates soon.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。答案：C黑色陷阱：此题的陷阱是句型，本句型区别于祈使句+or，这个句型的含义是“,不然的话/否那么。绿色通道：祈使句后面既可以加 and，也可以加 or，所以要全面分析句意，再作决定。小试牛刀：用 if 连接以下句子1、Go to bed early and you will have a good rest.2、Hurry up,or you ll miss the bus.三、if 从句与主句具有以下特点：1.If 从句中用一般现在时，表示未来的一种条件，从句中可以加时间状语。e.g.If you canIf it doesn t eome tomorrow,we can hold the party a little later.明天你如果不能来，我们可迟一点举行宴会。t rain tomorrow,we ll go to the Great W 天如果不下雨，我们就去长城。2.当 if 表示未来的条件时，主句中用一般将来时，从句用一般现在时，即“主将 _。表示如果某种条件存在，就有可能/不可能发生什么事情。e.g.If you don t get up early,you will be late for school.If I play games on it,it will go wron g.你如果不早点起床，上学就会迟至 U。如果我用它玩游戏，它就会坏掉。3.if 从句可放在主句前或主句后，从句置于主句前时，须用逗号与主句隔开，反之那么不用逗号。e.g.If it s fine tomorrow,we can go out.女口果明天天气好，我们就能出去。She will be happy if she joi ns the party.I ll ask the teacher for help if I don如果她参加聚会她会很开心的。t ur 如果我不懂我会求助老师的。三.注意 if 引导的条件状语从句和宾语从句的区别if 可以用来引导宾语从句也可以用来引导条件状语从句，主要是要弄清语从句时，意为“是否。要根据实际情况来确定时态，而一般时代替将来时，即“主将从现。e.g.I want to know if he will come here tomorrow.我想知道他明天是否至 U 这儿来。tomorrow，所以 if 从句要用一般将来时。if 引导从句的时态。if 在引导宾，要用if 在引导条件状语从句时意为“如果，假设if 在上句引导的是宾语从句，从句中有很明显的表将来的时间状语e.g.If it rains tomorrow,we ll put off the sports meeting.女口果明天下雨，我们就推迟运动会。tomorrow，从理论上讲也应该用一般故从句谓语用 rains 而不用 will rain.if 在上句引导的是条件状语从句，尽管从句中也有表将来时的时间状语将来时，但是在 if 引导的条件状语从句中要用一般现在时代替一般将来时，二、典题分析1、2022 上海We will have no water to drink _ we don protect the earth.A.un tilB.beforeC.thoughD.if答案D.解析if 引导条件状语从句，表示“如果。意思是如果我们不保护地球，我们将会没有水喝。2、2022 重庆We will plant trees tomorrow,and I donA.if B.which C.whatD.whereTom 会不会去。tknow _ Tom will come and join us.答案A.解析if 引导宾语从句，表示“是否。意思是我们明天将会去植树，但是我不知道3、一 Do you know if _ finished the work?Not yet.If he _,he will give me a call.A.he will finishB.he finishesC.he ,finishesD.he ll,will finishNot yet.中可以看出从句答案C.解析问句的 if 引导宾语从句，表示应该用现在完成时态，答句的“是否，从句要用陈述语序，从答句if 引导状语从句，要遵循主将从现的规律。练习一、用 if 连接下面的句子:1、You do not un dersta nd the article.Ask your teacher.2、You want to know more about it.Please call your teacher.3、Tell him to make a phone call to me.He will come here tomorrow.4、You want to go.Please tell me.5、Look at our website.The camera does not work.、用所给的提示词组成一个if 引导的条件状语从句。1be tired,have a rest(Tom)、2not go to bed early,feel sleepy(you)、3become un healthy,not eat vegetables、4no t liste n to the teacher,not study well、(childre n)(1)(Da Wei)5、fall behi nd others in study ing,spe nd too much time on the games、单项选择:1.You are sure to pass the exam _ you study hard.A.if B.though C.that D.si nee2.Ill go to see the film with you_I have time this eve ning.A.whether B.so C.if D.whe n3._ you study harder,youll never pass the final exam.A.IfB.Un tilC.Un less D.Except4.We ll stay at home if it _ this after noon.A.rainB.rains C.to rainD.raining5.We will go to the Great Wall if it _ tomorrow.A.won t rainB.isn t rainingC.rainedD.doesn t rain6.I don t know if heHe will come if itA.comes;won t rain.B.will come;does nt rainCcomes;does nt rain.Do you know what time _7A.the train leaveD.will come;won t rain?B.does the train leaveD.the train leavesC.will the train leave8.Do you think ifan English film tomorrow night?A.is thereB.there is going to haveD.will there beC.there is going to be9.Will you please tell me?B.how far Pudo ng Airport wasD.when was Pudong Airport builtA.where Pudong Airport isC.how can we get to Pudong Airport10.Mike wants to know ifa picnic tomorrow.Yes.But if it_,we II visit the museum in stead.Ayou have;will rainB.you will have;will rain.Cyou will have;rainsD.will you have;rains.11Why didn t Nick come to school yesterday?._ he was ill.AAfterBC.Where.WhenD.Because12t carry it.This box isheavy1 can.Atoo;toC.D.too;thatB.so;thatvery;that.13I don t knowhe still liveshere.ABC.whe nD.whetherwherewhat.14.-Do you know if heto play basket ball with us?-I thi nk he will come if he_ free tomorrow.A.comes;isB.comes;will beC.will come;isD.will come;will be t swim,the dolphins may come up _ him.D.falls;helpi ng15.1 n the z oo if a child _ into the water and canA.will fall;to helpB.falls;to helpC.will fall;help16n the bookshop,a reader asked the shop keeper _ Who Moved My Cheese was an interesting book.17、I want to know _ you have a brother.D.them18、We will go hiking if it _ tomorrow.A.will be fine B.is fine C.be fine D.is gong to be fine19、Maybe you_ if you make some bad friends.A.go wrongB.will go wrongC.go ing wrongD.is going to be wrong20、一 Do you know if _ finished the work?Not yet.If he _,he will give me a call.A.he will finishB.he finishesC.he ,finishesD.he ll,will finish答案：1-5 ACCBD 6-10 BDCAC16-20、DABBC1-15 DBDCB
