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初中英语―条件状语从句一．条件状语从句的概念条件状语从句，即在某种条件下，一件事情可能发生。在英语中由连接词if或unless等引导的状语从句叫做条件状语从句。条件是指某一件事情实现之后（状语从句中），一件事情（主句）才能发生，通常译作“假如，只要，如果”等意思。条件状语从句中，主从句的时态要遵循“主将从现”的原则。即，主句是将来时态时，从句用一般现在时代替将来时态。二.条件状语从句的引导词1.Ifconj.如果，假如Ifyouaskhim，hewillhelpyou．如果你请他帮忙，他会帮你的。Ifyoufailintheexam，youwilllethimdown．如果你考试不及格，你会让他失望的。2.unlessconj.除非,若不,除非在……的时候（if...not...）Youwillfailtoarrivethereintimeunlessyoustartearlier.如果你不早点动身,你就不能及时赶到那儿。Unlessitrains,thegamewillbeplayed.除非下雨,比赛将照常进行。3.so/aslongasconj.只要Youmayborrowmybookaslongasyoukeepitclean.只要你保持书的清洁，你就可以把我的书借去。三．关于条件句的时态，常见的有以下三种情况：1、条件状语从句的主句是一般将来时，那么从句常常用一般现在时。WhenIgrowup,I’llbeanurseandlookafterpatients.我长大后要当一名护士，照顾病人。2、如果主句是祈使句，那么从句通常要用一般现在时。Ifyouwanttohaveachat,callmeup.如果你想聊天，打我电话。3、如果主句是含有情态动词时，根据需要从句多用一般现在时。Youshouldbequietwhenyouareinthereadingroom.在阅览室时应保持安静。四．知识拓展1在以when，before，assoonas等引导的时间状语从句，也适用“主将从现”原则，即如果主句是一般将来时，从句则用一般现在时。I'lltellherthegoodnewswhenshecomesback.当她回来的时候，我将把这个好消息告诉她。shewillgiveyouacallassoonasshereturns.她一回来就会给你电话。2.If条件句的同义句：祈使句，and/or+将来时态的陈述句。Workhard,andyouwillmakegreatprogress.=Ifyouworkhard,youwillmakegreatprogress.如果你努力学习，你才会取得大的进步。Hurryup,oryouwillbelate.=Ifyoudon’thurryup.youwillbelate.如果你不快点，你就要迟到了。条件状语从句的时态练习一、用所给词的适当形式填空1.Wheni________(feel)tired,i_______________(have)tarest.2.Where_______he_________(see)thefilmifhe________________(have)time?3.Unlessthere__________(be)manytrees,there_______________(be)morepollution.4.He_____________(dress)morecasuallyunlesshe________________work)onweekends.5.IfMarcia_____________(live)alone,she___________________(keep)apetparrot.6.Lana________________(buy)anewdressassoonastheoldone__________(be)outofstyle.7.Thetwins______________(fight)whenthey_______________(argue).8.I____________(have)abakesaleifI_____________(need)moneyforeducation.9.Peter_____________(send)meabeautifulsouveniraslongashe_____________(tour)Spain.10.AslongasMrGreen__________(say)Iamhard-working,myparents_________(feel)glad.11.I____________(go)tothebeachifit________________(notrain)thisweek.12.__________they__________(have)amatchiftheP.E.teacher_____________(be)busy?13.He____(write)alettertohisgrandparentsaslongashe____(be)freeoftask..14.Unlessshe____________(get)uplate,she_____________(catch)theearlybus.15.Peter________(major)inEnglishifhe____(pass)theexamsinPekingUniversity.15.如果他到的晚了会发生什么事情？What_______________ifhe_____________late?16.如果努力学习，你就会取得好成绩。Ifyou___________________,you___________good_____________.17.他如果不看电视了，他的父母会很高兴。Unlesshe_________TVtoomuch,hisparents____________________veryhappy.18.如果我们为他组织生日聚会，大家都会来的。Everyone________________ifwe_____________abirthdayparty__________him.19.除非明天下雨，否则我将和你一起去公园的。Unlessit____________________tomorrow,I______________gotothepark_________you.20.如果她睡过头了，就会旅游迟到的。She;__________________________thetripifshe___________________.21.只要他有空，他会帮助你的。Aslongashe_________________,he_________________you.22.如果Tom考试不及格，他就没有机会上高中了。Tom_________havethe________togotothe________highschoolifhe________theexams.23.你如果抄同学的作业就不能学好各门功课。You____________goodateverysubjectsifyou______theotherstudents’homework..二、单项选择（15分）1.Ifyou_____totheparty,you’llhaveagreattime.A.willgoB.wentC.goD.going2.Itwillbealongtime____Peter_____hiswork.A.since,hasfinishedB.after,finishesC.when,willfinishD.before,finishes.3.Whatwillfatherbringus,______hecomesfromChina.A.ifB.whenC.aslongasD.untill4.Ifwangfang____________me,_________meatonce.A.need,tellB.needs,tellingC.need,tellingD.needs,tell5．I____hertheanswerifshe____me.A.cantell,willaskB.willtell,willaskC.wouldtell,askD.willtell,asks6.–Whatareyougoingtodotomorrow?--We’llgotothelibrarytomorrowifit___.A.isn’trainB.rainC.won’trainD.doesn’train7.—Doyouknowwhenhewillcomebacktomorrow?--Sorry,Idon’tknow.Whenhe____back,I’lltellyou.A.comesB.willcomeC.comeD.maycome8.Whatwillyoudoifyou_____totheoldfolk’shomevisit?A.goB.wentC.goingD.willgo9.___________Ieatmuchfood,I’llbeveryfat.A.AlthoughB.ifC.whileD.because10.I’llnotgivethebooktohim________hewillcomeherenextSunday.A.ifB.aslongasC.thoughD.unless11.There____anEnglishfilminourschooltomorrow.A.isgoingtohaveB.willhaveC.isgoingtobeD.has12.Couldyoutelluswhere____？A.willthenextOlympicGamesheldB.thenextOlympicGameswillbeheldC.wouldthenextOlympicGamesbeheldD.thenextOlympicGameswouldbeheld13.Whenmymotherreturnedlastnight,I____abook.A.readB.amreadingC.wasreadingD.amgoingtoread14.What____you____whenitbegantorain?A.do,doB.were,doingC.are,doingD.did,do15.I’llwakeyouupwhenhe____back.A.willB.isgoingtocomeC.comesD.come