b2m5语法 时间状语从句+原因状语从句

一、时间状语从句1）概念：表示动作发生的时间,用来修饰主句或主句的谓语，起状语作用的从句。2）引导词：when,while,as,until，till(直到)，theminute,themoment，assoonas，hardly/scarcely…when，nosooner…than，immediately，directly，instantly(一…就),each/every/next/thefirsttime，before，after,since,bythetime(到…为止)3）各种引导词的用法1when和while的用法：都译为：“当…时”有两个区别:①while+延续性动词when+延续性动词/非延续性动词______theyheardthenews,theywereveryexcited.__________Ilivedthere,IusedtogototheseashoreonSundays.②when还可译为“这时”常用于以下句型：WhenWhen/Whilebeabouttodo…when正要做某事…这时bedoingsth…when正在做某事…这时haddone…when刚做完某事…这时注意：这时的when不可以换成while造句：当我正要出门的时候，这时电话响了。当他正在睡觉的时候，………………………当他刚刚锁上门的时候，这时我来了。2as的用法：译为“一边…一边”或“随着”例句：Hehurriedhome,lookingbackashewent.Astimewenton,it’sgettingwarmerandwarmer.3bythetime的用法：译为：“当…时”主句（haddone）bythetime+did主句（willhavedone）bythetime+do例句：BythetimeIgottothestation,thetrainhadalreadygone.Bythetimeheretires,hewillhaveworkedfor35years.重点记：主句谓语动词的时态练习：Bythetimeyougetmyletter,I____________(leave)forever.Myparents__________(go)tobed,bythetimeIfinishedmyhomework.willhavelefthadgone4till(不放在句首),until的用法：译为：“直到”看例句：Iwaiteduntil/tillthefamousstarcame.Ididn’tleaveuntil/tillthefamousstarcame.总结：主句谓语为延续性动词，用肯定式主句谓语为非延续性动词，用否定式5）themoment/minute，assoonas，immediately，directly，instantly，hardly/scarcely…when，nosooner…than，(一…就)的用法例句：Theboystoppedcryingthemomenthesawhismother.hardly/scarcely…when，nosooner…than主从句时态Theboyhadhardly/scarcelystoppedcryingwhenhesawhismother.…………hadnosoonerstoppedcryingthanhesaw……Hardly/ScarcelyNosoonerhadtheboystoppedcryingwhenhesawhismother.hadtheboystoppedcryingthanhesawhismother.hardly/scarcely…when，nosooner…than位于句首，主句要部分倒装。6)since的用法：译为“自从”句型：Itis/hasbeen+时间段+sincedidItis/hasbeenfouryearssincetheymetlasttime.练习：1.Itwasquiet________thosebigtrucksstartedcomingthroughthetown.A.beforeB.afterC.untilD.unless2.Hardlyhadhereachedtheschoolgate________thebellrang.A.whileB.whenC.asD.assoonas3.Weweretoldthatweshouldfollowthemainroad_____wereachedthecentralrailwaystation.A.wheneverB.untilC.whileD.wherever4.Irecognizedyou________Isawyouattheairport.A.themomentB.whileC.afterD.once5.Hewasabouttogotobed________thedoorbellrang.A.whileB.asC.beforeD.when6.________Ilistentoyouradvice,Igetintotrouble.A.EverytimeB.WhenC.WhileD.Until7._____JohnwaswatchingTV,hiswifewascooking.A.AsB.AssoonasC.WhileD.Till8.NosoonerhadIarrivedhome_____itbegantorain.A.WhenB.whileC.asD.than9.Severalweekshadgoneby_____Irealizedthepaintingwasmissing.A.asB.beforeC.sinceD.when10.It_____longbeforewe____theresultoftheexperiment.A.willnotbe;willknowB.is;willknowC.willnotbeknowD.is;know11.–Whatwasthepartylike?--Wonderful.It’syears_____Ienjoyedmyselfsomuch.A.afterB.beforeC.whenD.since12.Ithoughtherniceandhonest_____Imether.A.firsttimeB.forthefirsttimeC.thefirsttimeD.bythefirsttime13.HewillhavelearnedEnglishforeightyearsbythetimehe_____fromtheuniversitynextyear.A.willgraduateB.willhavegraduatedC.graduatesD.istograduate14.______thedaywenton,theweathergotwarmer.A.WithB.SinceC.whileD.As15._______,AlexanderGrahamBellwasstillayoungman.A.HeinventedthetelephoneB.InventedthetelephoneC.ThetelephonewasinventedD.Whenheinventedthetelephone16.Hewastoldthatitwouldbeatleastthreemoremonths__________hecouldrecoverandreturntowork.A．whenB．beforeC．sinceD．that17.TheAmericanCivilWarhadlastedfouryears____theNorthwonintheend.A.afterB.beforeC.whenD.then18.Youcan'tborrowbooksfromtheschoollibrary_____yougetyourstudentcard.A.beforeB.ifC.whileD.as19.Wewillstandupthemomentourheadteacher______intotheroom.A.comesB.cameC.tocomeD.willcome20.Peopledon’tknowthevalueofthefreedom,_______theyhavelostit.A.untilB.whenC.sinceD.as21.----It'salongtime______Isawyoulast.----Yes,andwhatapityitisbecauseitwillbealongtime______weseeeachotheragain.Abefore;sinceBsince;whenCsince;beforeDwhen;before22.Wasitmidnight______youarrivedhomebytaxi?A.thatB.atwhichC.thetimeD.when二、原因状语从句1）概念：表示动作发生的原因，用来修饰主句或主句的谓语，起状语作用的从句。2）引导词：because（因为）for（因为）since（由于）as（由于）nowthat（既然）3）各种引导词的用法1.because语气最强，表示直接的原因。注意：why引出的疑问句必须用because来回答;不与so连用。-----Whyyoustayedathome?-----Becauseitrained.2.for“因为”不是动作发生的直接原因，不能放在句首。Thedaybreaks，forthebirdsaresinging.练习：______herdaughterhadn’tcomeback,______shelookedworried.A.Because,/B.Because,soC.Though,butD.Though,/3.as“由于”（和since可以换用）语气比because弱，表示“说话双方已知的、显而易见的理由”引导的原因状语从句多位于主句之前。As/Sinceitissnowing,weshallnotclimbthemountain.4.nowthat“既然”Nowthatyouhavepassedyourtestyoucandriveonyourown.练习：1._______you’vegotachance,youmightmakefulluseofit.A.NowthatB.AfterC.AlthoughD.Assoonas2.Hefounditdifficulttoread,_______hiseyesightwasbeginningtofail.A.andB.forC.butD.or3.Ididn’tgo_____Iwasafraid.A.sinceB.forC.becauseD.though4.______theweatherissobad,wehavetodelayourjourney.A.BeforeB.SinceC.TillD.After5._____youarehere,you’dbetterstay.A.BeforeB.NowthatC.TillD.After6.______ithappenedtobeaniceday,wedecidedtogotothebeach.A.WhenB.BeforeC.IfD.Since7.I’msorryyou’vebeenwaitingsolong,butit’llstillbesometime____Briangetback.A.beforeB.sinceC.tillD.after7.Itwas_____shehassomethingimportanttodothatshedidn’tgototheparty.A.asB.forC.sinceD.becausethe7.______theplanhasbeenmade,let’sgetdownto__