if引导的条件状语从句

1语法10单元语法再现梁老师组稿2017-12-31一、观察下面的句子Ifyougototheparty,youwillhaveagreattime.Ifyoudo,youwillbelate.Ifyoudo,youwillbesorry.Iftheyhaveittoday,halftheclasswon’tcome.Ifweaskpeopletobringfood,theywilljustbringpotatochipsandchocolate.以上几个句子中“if”有相同的含义“如果”，引导条件状语从句逗号后面的句子是主句。整个连起来的大句子叫主从复合句。注意主句和从句的时态有什么特点。总结：If引导的条件状语从句用一般现在时，主句用一般将来时。简称“主将从现”练习：（1）Ifyou______(come)here,you___________(be)happy.(2)Ifit_________(rain)tomorrow,we__________(not,go)tothepark.(3)Ifhe_________(come)here,I___________(call)you.(4)Ifit___________(notrain),we_________(have)apicnic(野餐).(5)Ifwedothat,morepeople_________(want)toplaythegames.(6)Ifthey_______that,thegames_______(be)moreexciting,too.(7)What______happenifthey_______(have)thepartytoday?(8)What______happenifthey_______avideoattheparty?(9)Ifhe______(take)ataxi,it_______(be)tooexpensive.(10)IfI_______(go)tothemovies,I____________(finish)myhomework.条件状语从句的引导词还有“unless除非（否则），如果不”Youwon’tpasstheexamunlessyoustudyhard.2Unlessyoudealwith(处理）yourproblems,youwillbeunhappy.二、同样when可以引导状语从句“主将从现”也适合也就是说：when引导的时间状语从句也是一般现在时，主句也是一般将来时。Whatareyougoingtobewhenyougrowup?Whatishegoingtobewhenhegrowsup?三、“主将从现”的含义扩充主：表示主句将：（1）主句是一般将来时（2）主句是祈使句（3）主句含有情态动词can、may、must/haveto从：表示状语从句现：表示状语从句是一般现在时例句：(1)Don'tgoandplayfootballifyourhomework______________(notfinish).(2)Ifit____________(notrain)tomorrow,we______________(go)toclimbthehill.(3)Hewon'tleaveuntilyou_______________(agree)withhim.(4)Youcancrosstheroadwhenthelights_________(turn)green.(5)I_____________(call)youassoonashe____________(tell)meaboutthegoodnews.(6)ThestudentswillgotoSummerPalaceifit__________tomorrow.3A.don'trainB.won'trainC.doesn'trainD.isn'train四、if翻译成“是否”，引导宾语从句，时态是：一般将来时。例如：Idon’tknowifhewillcometomorrow.V.HeasksmeifIwillbefree.V.Theywanttoknowiftheywillhaveapartynextweek.V.注意把if的两个意思放在一道题中考试。（主将从现宾将）MarywantstoknowifTomwillcome.Ifhecomes,IwillcallMary.练习：1.Idon'tknowifit_____tomorrow.Ifit____,we'llgooutforapicnic.A.willrain;doesn'trainB.willrain;rainsC.rains;willrain2.---DoesTedtellyouifhe___nextSunday?---No,hedoesn't.Butifhe___.I'llgiveyouaring.A.willcome;willcomeB.comes;willcomeC.comes;comesD.willcome;comes3.---Iwonderifit____tomorrow.---Don'tworry.Ifit____,we'llstayathome.A.rains;rainsB.willrain;rainsC.rains;willrain五、含有时间状语从句的主从复合句，常考时态有两种可能：常考的引导词when、assoonas(一------就------）、4not---until--（直到------才---）主句从句1、主将从现（1）Heisgoingtobeanengineerwhenhegrowsup.主句：一般将来时when引导的时间状语从句一般现在时（2）Iwillcallyouassoonashecomeshere.主句：一般将来时assoonas引导的时间状语从句一般现在时(3)Iwon’tgotobeduntilIfinishmyhomework.主句：一般将来时until引导的时间状语从句一般现在时2、第二种情况：主句和时间状语从句都是一般过去时态（要过去都过去）Ididn'tgotoworkuntilIfinishedmyhomework.我直到完成了作业才上床睡觉。