条件状语从句-初二英语

2015-12-20条件状语从句1、定义由引导词if或unless引导的状语从句叫做条件状语从句。在英文中，条件是指某一件事情实现之后(状语从句中的动作)，其它事情(主句中的动作)才能发生，通常译作假如。(注意:在含有条件状语从句的复合句中，表示将来时态，主句是一般将来时态,祈使句或谓语动词是情态动词，从句要用现在时态,即[主将从现原则]。Eg1:Takethemedicine,youwillbefine.Eg2:IfyoucanreadasmanyEnglishbooksaspossible,yourEnglishwillbeimproved.2、用法语法引导条件状语从句最常用的连词是if,由if引导的条件状语从句表示在某种条件下某事很可能发生if引导的条件状语从句既可以将从句放前面也可以将从句放后面。除了if之外，还有其他连词也可以引导条件状语从句。【注：在条件状语从句中，绝大数情况下some要变为any。】(1)unlessconj.除非，若不，除非在……的时候Eg1:Youwillfailtoarrivethereintimeunlessyoustartearlier.如果你不早点动身，你就不能及时赶到那儿。Eg2:Unlessitrains,thegamewillbeplayed.除非下雨，比赛将照常进行。(2)oncondition(that)...在……条件下，如果oncondition(that)...引导的条件从句是主句事件发生的前提条件或唯一条件。Eg1:Icantellyouthetruthonconditionthatyoupromisetokeepasecret.我可以告诉你真相，条件是你答应保密。Eg2:Youcangoswimmingoncondition(that)youdon'tgotoofarfromtheriverbank.你只有在不远离河岸的条件下才可以下水游泳。Attention（注意）：①unless=if...not.Eg:Let'sgooutforawalkunlessyouaretootired.Ifyouarenottootired,let'sgooutforawalk.②if引导的条件句有真实条件句和非真实条件句两种：真实条件句Eg：Ifitrainstomorrow,wewon’tgoonapark非真实条件句是虚拟语气的一种，表示与事实相反，主句用woulddo，从句用过去式，具有假设性，一定不会是真的,即所假设的事情基本不会有发生的可能。Eg：IfIwereyou,Iwouldgowithhim.③so/aslongas（只要）、incase（万一）引导。Eg1:Solongasyou’rehappy,itdoesn’tmatterwhatyoudo.只要你高兴，你做什么都没有关系。Youmayborrowmybookaslongasyoukeepitclean只要你保持书的清洁，你就可以把我的书借去。Eg2:Takeyourumbrellaincaseitrains.带着你的伞吧，以防下雨。④“祈使句+and/or+简单句”。其中and表示句意顺承；or则表示转折，意为“否则”。Eg1:Ifyouworkharder,you’llpasstheexam.=Workharder,andyou’llpasstheexam.如果你再努力些，你就会通过考试。Eg2:Ifyoudon’thurryup,you’llmissthetrain.=Hurryup,oryou’llmissthetrain.如果你不快点儿，你就赶不上火车了。3、练习题Ⅰ.单项选择1.Ifyou_____totheparty,you’llhaveagreattime.A.willgoB.wentC.goD.going2.Itwillbealongtime____Peter_____hiswork.A.since,hasfinishedB.after,finishesC.when,willfinishD.before,finishes.3.Whatwillfather_____usfromJapan?A.takeB.bringC.carryD.make4．I____hertheanswerifshe____me.A.cantell,willaskB.willtell,willaskC.wouldtell,askD.willtell,asks5.–Whatareyougoingtodotomorrow?--We’llgotothelibrarytomorrowifit____.A.isn’trainB.rainC.won’trainD.doesn’train6.—Doyouknowwhenhewillcomebacktomorrow?--Sorry,Idon’tknow.Whenhe____back,I’lltellyou.A.comesB.willcomeC.comeD.maycome7.Whatwillyoudoifyou_____totheoldfolk’shomevisit?A.goB.wentC.goingD.willgo8.IfIeat____food,I’llbeveryfat.A.toomanyB.manytooC.toomuchD.muchtoo9.I’llgivethebooktohimifhe___herenextSunday.A.willcomeB.comesC.iscomingD.came10.There____anEnglishfilminourschooltomorrow.A.isgoingtohaveB.willhaveC.isgoingtobeD.has11.Couldyoutelluswhere____？A.willthenextOlympicGamesheldB.thenextOlympicGameswillbeheldC.wouldthenextOlympicGamesbeheldD.thenextOlympicGameswouldbeheld12.Whenmymotherreturnedlastnight,I____abook.A.readB.amreadingC.wasreadingD.amgoingtoread13.What____you____whenitbegantorain?A.do,doB.were,doingC.are,doingD.did,do14.I’llwakeyouupwhenhe____back.A.willB.isgoingtocomeC.comesD.comeII.同义句转换1.Runfast,oryou’llbelateforschool._______you______________fast,you’llbelateforschool.2.Youcanbuythedictionaryifyoutakeenoughmoneywithyou.Takeenoughmoneywithyou,_________________buythedictionary.3.Ifthereisnoair,noneofuscanlive.Noneofuscanlive________________.Ⅲ、用所给词的适当形式填空1.Ifyou______(feel)tired,you_____(have)tohavearest.2.Where_____he____(see)thefilmifhe_______(have)time?3.Ifthere____(be)fewertrees,there____(be)morepollution.4.He___(dress)morecasuallyifhe___(notwork)onweekends.5.IfMarcia______(live)alone,she_______(keep)apetparrot.6.Lana___（buy）anewdressiftheoldone___(be)outofstyle(过时).7.Thetwins______(fight)（打架）ifthey_____(argue).8.Peter____(send)meabeautifulsouvenir（纪念品）ifhe____(tour)Spain.9.IfMrGreen_______(say)Iamhard-working,myparents___(feel)glad.10.I______(go)tothebeachifit______(notrain)thisweek.11._____they___(have)amatchiftheP.E.teacher__(be)busy?12.He____(write)alettertohisgrandparentsifhe____(get)hisreportcardthisweek.13.Ifshe____(get)uplate,she____(notcatch)theearlybus.Ⅳ.完成句子1.如果他到得晚了会发生什么事情？What____________ifhe______late?2.如果努力学习，你就会取得好成绩。Ifyou__________,you___good____.3.他如果看电视太久了，他的父母会不高兴。Ifhe_____TVtoomuch,hisparents______________unhappy.4.如果我们为他组织生日聚会，大家都会来的。Everyone____ifwe_____abirthdayparty_____him.5.如果明天不下雨，我会和你一起去公园的。Ifit___________tomorrow,I_____gotothepark______you.6.如果她睡过头了，就会旅游迟到的。She____________thetripifshe________.7.如果他有空，他会帮助你的。Ifhe________,he__________you.8.如果Tom考试不及格，他就没有机会上高中了。Tom___havethe___togotothehighschoolifhe___theexams.9.你如果抄同学的作业就不能学好各门功课。You__________goodatallthesubjectsifyou_____theotherstudents’homework.选择是难，更何况是心灵选择。高渐离为了荆轲，他选择了死；马本斋母亲为了革命，她选择了牺牲；祝英台为了真挚爱情，她选择了化蝶。在这友情、亲情与爱情之间选择，他们是这样做多事的东风，又冉冉地来到人间，桃红支不住红艳的酡颜而醉倚在封姨的臂弯里，柳丝趁着风力，俯了腰肢，搔着行人的头发，成团的柳絮，好像春神足下坠下来的一朵朵的轻云，结了队儿，模仿着二月间漫天舞出轻清的春雪，飞入了处处帘栊。细草芊芊的绿茵上，沾濡了清明的酒气，遗下了游人的屐痕车迹。一切都兴奋到了极点，大概有些狂乱了吧？在这缤纷繁华目不暇接的春天！