♦if引导的条件状语从句条件状语从句是在复合句中作条件状语的句子。表示假如有从句的动作发生就会有主句的动作发生。条件状语从句常由从属连词if引导。♦if引导的条件状语从句使用须知：一、位置if引导的条件状语从句，既可放在主句之前也可放在主句之后。当从句置于主句之前时，常用逗号与主句隔开。例如：Youwillcatchthebusifyougetupearly.=Ifyougetupearly,youwillcatchthebus.如果你早起的话，就能赶上公共汽车。二、时态应遵循主、从句时态呼应的原则。当主句是一般现在时（包含祈使句和含情态动词can,may,must等的句子），从句也用一般现在时。例如：Youmustseethedoctorifyouareill.如果你生病了，你必须去看医生。Ifyouwanttogoskating,wearwarmclothes.如果你想去滑冰，穿上暖和点的衣服。如果主句是一般将来时，从句必须用一般现在时。例如：Youwillbelateforschoolifyougetuplate.如果你起晚了，你上学将迟到。Ifitrainstomorrow,wewon'tgototheGreatWall.如果明天下雨，我们就不去长城了。三、注意事项在if引导的条件状语从句中，当主句是一般将来时时，不能够使用begoingto结构，而要用will。例如：I'llhelpyouwithyourEnglishifIamfreetomorrow.如果明天我有空，我会帮你学英语。在if引导的条件状语从句中不能够使用some，而要用any。例如：Ifyouhaveanyquestionstoask,pleasecometomyoffice.如果你有问题要问的话，请到我办公室来。四、同义句转换if引导的条件状语从句可以转换成简单句，其
方法
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如下：借助"祈使句+and/or+简单句”。其中and表示句意顺承，or表示转折。例如：Ifyouworkhard,you'llpasstheexam.=Workhard,andyou'llpasstheexam.如果你努力学习，你就会通过考试。Ifyoudon'thurryup,you'llbelate.=Hurryup,oryou'llbelate.如果你不快点，你将会迟到。借助介词with或without来转换。例如：Ifyouhelpme,I'llfinishmyjobsoon.=Withyourhelp,I'llfinishmyjobsoon.如果你帮我，我将很快完成我的工作。Ifthereisnowater,fishmaydie.=Fishmaydiewithoutwater.如果没有水，鱼可能会死。【巩固练习】一、用所给动词的适当形式填空。1.IfIruneveryday,I(be)healthier.2.Ifyou(noteat)healthily,yourbodywon'tbewell.3.Ifyousleepwell,you(feel)better.4.Ifyou(relax),you'llsleepbetter.5.Domoreexercise,anditwillmakeyourmindandbody(work)better.二、完成句子(一空一词)。1．如果你要过马路，不要乱跑。aroundifyoucrosstheroad.2．明天如果下雨的话，我们将呆在家里。Weathomeifittomorrow.如果你能说好英语的话，你就可以容易地与外国人交谈。IfyoucanEnglishwell,youforeignerseasily.4.如果你对别人好，人们也会对你好。Ifyou'renicetopeople,theytoyou,too.5.如果学生不对考试如此担心的话，他们会更开心的。Ifstudentsdon'tworryaboutexamssomuch,they.三、同义句转换。Studyhard,oryouwon'tpasstheexam.Ifyoustudyhard,youtheexam.Takeataxi,andyou'llcatchthetrain.youataxi,you'llcatchthetrain.Ifyougotobedearly,youwon'tfeeltiredinthemorning.early,youwon'tfeeltiredinthemorning.Ifyoudon'tworkhard,yourteacherwillprobablybeangry.,yourteacherwillprobablybeangry.5.Breathedeeplyforoneminute,andyou'llfeelrelaxed.youdeeplyforoneminute,yourelaxed.四、阅读下面的广告，然后用“if…，…will…”句式回答问题。TravelBrochureCheapCheapCheap.Beijingfortheweekend.3D/2N.BookNow.FiveStarHotel—Save50%FourStarHotel—Save40%ThreeStarHotel—Save30%BookbeforeDecember31st.BreakfastIncluded.CityTour50RMB.VisittheGreatWall100RMB.HowmuchwillyousaveifyoustayattheFourStarHotel?HowmuchwillyousaveifyoustayattheThreeStarHotel?WhatwillhappenifyoubookafterDecember31st?HowmuchwillyouhavetopayifyouwanttogoontheCityTour?HowmuchwillyouhavetopayifyouwanttovisittheGreatWall?IbookafterDecember31st,itwillbetoolateandmoreexpensive.4.IfIwanttogoontheCityTour,Iwillhavetopay50RMB.5.IfIwanttovisittheGreatWall,Iwillhavetopay100RMB.
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