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1、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。在英语屮由连接词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。条件状语从句屮,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l.Ifconj・如果,假如Ifyouaskhim,hewillhelpyou.如果你请他帮忙,他会帮你的。Ifyoufailintheexam,youwilllethimdown
2、.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
3、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
4、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.=Ifyou
5、don'thurryup.youwillbelate>如果你不快点,你就要迟到了。条件状语从句练习精讲(含答案)I.单项选择1・Ifyoutotheparty,youTlhaveagreattime・A.willgoB.wentC・goD.going2.ItwillbealongtimePeterhiswork.A.since,hasfinishedB.after,finishesC・when,willfinishD・before,finishes.3.WhatwillfatherusfromJapan?A・takeB.bringC・carryD.make4.Weif
6、angisfamouskitesA.forB.toC.onD.with5•Ihertheanswerifsheme.A.cantell,willaskB.willtell,willaskC.wouldtell,askD.willtell,asks6.一Whatareyougoingtodotomorrow?・-WeUlgotothelibrarytomorrowifit・A.isn'trainB・rainC.won'trainD.doesn'train7.—Doyouknowwhenhewillcomebacktomorrow?一Sorry,Idon'tknow.Wh
7、enheback,Tiltellyou.A.comesB.willcomeC.comeD.maycome8.Whatwillyoudoifyoutotheoldfolk'shomevisit?A.goB.wentC.goingD・willgo9.IfIeatfood,Fllbeveryfat.A.toomanyB.manytooC・toomuchD・muchtoo10.TilgivethebooktohimifheherenextSunday.A.willcomeB.comesC.iscomingD・came11・ThereanEnglishfilm