if引导的条件状语从句
if引导的条件状语从句LELEwasfinallyrevisedonthemorningofDecember16,2020x观察下面的句子Ifyougototheparty,youwillhaveagreattime.Ifyoudo,youwillbelate.Ifyoudo,youwillbesorry.Iftheyhaveittoday,halftheclasswon'tcome.Ifweaskpeopletobringfood,theywilljustbrinypotatochipsandchocolate.以上几个句子中。F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)toplaythegamesIftheythat,thegames(be)moreexciting,too.(6) Whathappenifthey(have)thepartytoday?(7) Whathappeniftheyavideoattheparty?(8) Ifhe(take)ataxi,it(be)tooexpensive.(9) 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”Youwontpasstheexamunlessyoustudyhard.Unlessyoudealwith(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:卩)主句是一般将来时Y(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：Don'tgoandplayfootballifyourhomework(notfinish)Ifit(notrain)tomorrow,we(go)toclimbthehill.(1) Hewon'tleaveuntilyou(agree)withhim.(2) Youcancrosstheroadwhenthelights(turn)green.1(call)youassoonashe(tell)meaboutthegoodnews.(3) ThestudentswillgotoSummerPalaceifittomoiTOw.Adon'trainftrainC.doesn'trainDisn'train四、if翻译成“是否”，引导宾语从句，时态是：一般将来时。例女口:Idon'tknowifhewillcometomorrow.v.HeasksmeifIwillbefreeV.Theywanttoknowif.虫cy.WilLhQYeap3Tly£&LWCek.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:don'tknowifittomorrow.Ifit,we'llgooutforapicnic.A.willrain;doesn'trainBwillrain;rainsCrains;willrainTedtellyouifhenextSunday?一No,hedoesn'tButifheTilgiveyouaringA.willcome;willcomeB.comes;willcomeC.comes;comesD.willcome;comes3.一-1wonderifittomorrow.-一Don'tworryIfit、wellstayathomeA.rains;rainsB.willrain;rainsCrains;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（就）、notuntil（直至9才）主句从句1、主将从现(1)Heisgoingtobeanengineerwhenhegrowsup.主句：般将来时when引导的时间状语从句一般现在时Iwi"callyouassoonasheco加尙here.主句：一般将来时assoonas引导的时间状语从句一般现在时(3)I翌0"7律0obedimtilIfinishmvhomework.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。
