中考英语语法复习-条件状语从句

中考复习——条件状语从句定义：即从句是主句成立的条件。常见引导词有if（如果）,as(so)longas（只要）,unless（除非，如果不=if...not）。运用1：e.g.1.AtouristwilleasilylosehiswayinBeijing________hehasamaporaguide.A.ifB.becauseC.unlessD.when运用2：e.g.2.---ShallwegoforapicnicthisSaturday?---Allright，itrains.A.IfB.WhenC.UnlessD.Until过关练习11.Whatshallwedoitsnowstomorrow?2.Don’tleavethebuildingItellyouto.3.Youcangoouttoplayyoustayinthebackyard.4.Hewon'tgotosleepyoutellhimastory.5.---Wouldyouliketogohikingwithme,Susan?---I’dliketo,_______youdon’twanttogoalone.A.untilB.beforeC.ifD.after6.Youmayborrowmybook______________________________youkeepitclean.7.Manypeoplecan'tlearnanylessonsfromthemistakesthey'vemade_____theygethurtsomehow.A.whetherB.unlessC.ifD.as原理1：“祈使句+and(or)+陈述句”“祈使句+and(or)+陈述句”相当于一个带有条件状语从句的复合句。e.g.Hurryup,oryou’llbelate.=Ifyoudon’thurryup,you’llbelate.e.g.Studyhardandyouwillpasstheexam.=Ifyoustudyhard,youwillpasstheexam.过关练习21.Runfast,oryou’llbelateforschool.（同义句转换）_________you__________________fast,you’llbelateforschool.2.(give)meonemorehour,andI’llgettheworkfinished.3.Standoverthere________you’llbeabletoseetheoilpaintingbetter.A.butB.tillC.andD.or原理2:主将从现条件状语从句是对将来或虚拟的事件进行描述，主句经常使用的时态为一般将来时，从句必须用一般现在时来替代一般将来时。我们将这种语法现象称之为“主将从现”。(谓语动词通常用现在时态表示将来的动作或状态。)e.g.Wewillstayathomeifitrainstomorrow.e.g.I’llhelpyouwithyourEnglishifIamfreetomorrow.练一练：1.Helateunlessheisill.2.如果你不早点动身，你就不能及时赶到那儿。Youwillfailtoarrivethereintime________________________________________.3.---Whatareyougoingtodotomorrow?---We’llgotothelibrarytomorrowifit____.A.isn’trainB.rainC.won’trainD.doesn’train易错易混题：1.unless=if……note.g.lgoforanoutingtomorrowunlessitrainse.g.lgoforanoutingtomorrowifitdoesn’trains.过关练习31.---DoesDavidloveplayingbasketball?---Yes.Heplaysbasketballeveryday______ifitrainsheavily.A．whetherB.ifC.unlessD.as2.如果你不早点动身，我们就不能及时赶到那儿。（翻译）____________________________________________________________________________________________________________________________________________3．如果明天下雨，比赛将不会进行（翻译）____________________________________________________________________________________________________________________________________________2.主将从现的时态问题（多种时态的变化）从句中一般现在时表示一般将来时从句中现在完成时态表示将来完成时e.g.Youcangooutifyouhavefinishedyourhomework.参考答案：运用1-3C【练一练1】1.if2.unless3.aslongas4.unless5.C6.aslongas7.B【练一练2】1.ifdon'trun3.C+2.Give【练一练3】1.won'tbe2.unlessyoustartsearly3.D中【练一练4】1.C2.Ifyoudon'tstartearlier,you'llfailtogetthereintime.(同义句转换)