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1、一、条件状语从句一)if引导的条件状语从句(if意思为“如果”,主将从现)用法例句①主句为一般将来时态,if从句用一般现在时态(即主将从现)。Wewillstayathomeifitrainstomorrow.②主句中含有情态动词,if从句用一般现在时态。Ifyoufinishyourhomework,youcangohomenow.③主句为祈使句,if从句用一般现在时态。Don’tjumpintotheriverifyoufeelveryhot. ④主句为过去将来时,if从句用一般过去时态(如果涉及到be动
2、词,一律都用were)。此时,表达的是和现实相反的推测,用虚拟语气。IfIwereyou,Iwouldn’tdoitlikethat.如果我是你,我就不会那么做的。Ifyougavemesomemoney,Iwouldbeveryhappy. 如果你给我一些钱,我就会很高兴的。A:if条件句的时态搭配1.if从句用一般现在时,主句用一般将来时(如果表示可能发生的事)Ifherunshe’llgetthereintime.Ifyougotobedearlier,youwon’tfeeltirednextmorn
3、ing.2.if从句用一般现在时,主句用may/might/can/must/shouldIfthefoggetsthickertheplanemay/mightnottakeoff.Ifitstopssnowingwecangoout.Ifyouwanttoloseweightyoumust/shouldeatlessbread.3.if从句用一般现在时,主句用一般现在时(如果表示必然发生的事情)Ifyouheaticeitturnstowater.如果把冰加热,它就会化成水。Ifbearsareindan
4、ger,theyattackpeople.Ifyoudropaglass,itbreaks.B:"if"引导的条件状语从句的用法总结if条件句不一般,几个要点记心间;条件句,放在前,逗号要放句中间。条件句表可能,主句多用将来时;条件句表事实,主句常用现在时。在if引导的条件状语从句中,if和条件句位置灵活,但不管怎样,一定要学会冷静分析句意和句子结构。特别提醒:If只有当作为“如果”的意思时,才符合主将从现原则;如果If作为“是否”的意思时,则不符合主将从现原则。二)unless引导的条件状语从句,意思相当于
5、if....not...,语气比较强。(主将从现)You’llfailtheexamunlessyoustudyhard.=You’llfailtheexamifyoudon’tstudyhard.三)so/aslongas引导的条件状语从句,表示“只要”(主将从现)AslongasIknowthemoneyissafe,Iwon’tworryaboutit.Aslongasitdoesn’train,wecanplayfootball.二、时间状语从句以when,before,assoonas,once等引
6、导的适用“主将从现”原则 I'lltellmymotherthegoodnewswhenshecomesback.shewillcallyouassoonasshereturns.Onceyouseethefilm,youwillneverforgetit.一旦你看了这部电影,你将永远不会忘记。三、If条件句的同义句1.借助“祈使句+and/or+简单句”,其中and表示句意顺承,or表示转折。Ifyouworkhard,youwillpasstheexam.=Workhard,andyouwillpasst
7、heexam.Ifyoudon’thurryup.youwillbelate.=Hurryup,oryouwillbelate.2.借助介词with或without来转换。Ifyouhelpme,I’llfinishmyjobsoon.=Withyourhelp,I’llfinishmyjobsoon.Ifyoudon’tgivemeahand,I‘llnotcompleteitinsuchashorttime.=Withoutyourhelp,Iwon’tcompleteitinsuchashorttime
8、.课堂训练:1)勾选正确的答案完成句子。1.Daina(willgo/go/goes)toEuropeifshe(willpass/pass/passes)theexams.2.Thegraduates(willteach/teach/teaches)inthepoorvillageiftheMinistryofEducation(willagree/agree/agrees)soon.3.Ifth