2013深圳新版八年级上英语：If引导的条件状语从句better定稿

8Aunit7条件状语从句,语法：,例句：Ifpeopleobeythetrafficrules,therewillbefeweraccidents.,if引导的条件状语从句,if:从属连词，意思是：“如果，假如，倘若”,从句,主句,Therewillbefeweraccidentsifpeopleobeythetrafficrules.,原句可改为：,if引导的条件状语从句既可以放在句子前，也可以放在句子后。从句位于主句之前时，常用逗号将其与主句隔开。,结构：,主句谓语中也可以含有情态动词，如：must,can,could,should等,时态：,if引导的条件状语从句，主句用一般将来时（will）,从句用一般现在时。,例句：Ifpeopleobeythetrafficrules,therewillbefeweraccidents.,主句谓语中也可以用hadbetter(not)do,提建议,例句：如果交通指示灯是红的，你必须停下来等一等。,eg:Ifthetrafficlightsarered,youmuststopandwait.,例句：如果你想减肥，你最好锻炼。,eg:Ifyouwanttoloseweight,youhadbettertakesomeexercise.,“主将从现”,句式结构及时态：Ifanearthquakehappens,manybuildingswillfalldown.Ifafirehappens,dontbenervous.Ifacaraccidenthappenstoyou,whatshouldyoudo?,从句:,从句：一般现在时,从句：一般现在时,主句：,主句：祈使句,主句：含情态动词can/could/must/should等,一般现在时,一般将来时(will),Revision,句式结构：时态:,祈使句,一般将来时(will),一般现在时,情态动词(can/must/should/),Summary,If从句，+主句.,/主句+从句,3.口诀:_,条件状语从句：If,2.if从句用_，主句也用_，表示客观事实或习惯。,主现从现,如果我把玻璃杯扔掉，它就会摔碎。IfI_aglass,it_.,一般现在时,一般现在时,drop,breaks,Unless如果不，除非,条件状语从句:unless从句遵循if从句主将从现和主现从现的情况。,要领:unless=ifnot,1.如果明天不下雨，我们就去远足。Ifit_,wewillgohiking.=Wewillgohiking_2.如果你不把肉存放在冰箱里，它就会变坏。Ifyou_inthefridge,it_.=_inthefridge,it_.,Unless=Ifnot,unlessitrainstomorrow.,doesntraintomorrow,dontkeepthemeat,Unlessyoukeepthemeat,goesbad,goesbad,Unless=Ifnot,3.除非天下雨，他通常是走路去上学。Heusually_onfootifit_.=_,heusually_onfoot.4.如果你现在不走，你就赶不上火车了。Ifyou_,you_thetrain.=_,you_thetrain.,goestoschool,dontleavenow,Unlessitrains,goestoschool,Unlessyouleavenow,wontcatch,wontcatch,doesntrain,Summary,条件状语从句:,if从句,unless从句,主将从现,主现从现,时态口诀:,将来,客观事实习惯,用括号内所给词的正确形式填空：Ifhedoesntgototheparty,I_,either.Ifshe_(be)kindtome,I_(notargue)withher.Iwanttoknowifhe_(come)tomorrow,ifhe_(come),Iwillgivethemessagetohim.,wont,is,wontargue,willcome,comes,7.Ifyou(find/found)thegasleaksout,(open/opening)thewindowsassoonaspossible.8.Ifthere(willbe/was/is)afire,thehouse(willbe/was/is)beinruins(化为废墟).二、用括号内所给词的正确形式填空：Ifhedoesntgototheparty,I_,either.Ifshe_(be)kindtome,I_(notargue)withher.Iwanttoknowifhe_(come)tomorrow,ifhe_(come),Iwillgivethemessagetohim.,wont,is,wontargue,willcome,comes,4.Where_he_(see)thefilmifhe_(have)time?5.Ifthere_(be)fewertrees,there_(be)morepollution.6.Ifanearthquake_(happen)inShantou,canyouimaginewhat_(happen)?7.Ifyou_(have)acaraccident,youshouldcallyourparentsoryourfriends.8.Ifyou_(stay)athomealone,what_you_(do)?,will,see,has,are,willbe,happens,willhappen,have,stay,will,do,if的反义词：if.not.=unless,意思是：“如果不，除非”,IwontgothereunlessIhearfromyou.(同义)Iwontgothere_I_hearfromyou.,ifdont,IwontgotothepartyifIamnotinvited.(同义句)Iwontgototheparty_Iaminvited.,unless,变换：,1.有if引导的条件状语从句的复合句中，当主句和从句的主语均为you时，可转换为“祈使句，and+简单句”或“祈使句，or+简单句”,Youcanpasstheexamifyouworkhard.-，andyouwillpasstheexam.,Ifyoudonthurryup,youwillbelateagain.Hurryup,-youwillbelateagain.,Workhard,or,2.借助介词with或without来转换。例如:Ifyouhelpme,Illfinishmyjobsoon.-,Illfinishmyjobsoon.如果你帮我，我将很快完成我的工作。Ifthereisnowater,fishmaydie.Fishmaydie-.如果没有水，鱼可能会死。,Withyourhelp,withoutwater,注意事项1.在if引导的条件状语从句中，当主句是一般将来时时，不能够使用begoingto结构，而要用will。例如：IllhelpyouwithyourEnglishifIamfreetomorrow.如果明天我有空，我会帮你学英语。2.在if引导的条件状语从句中不能够使用some，而要用any。例如：Ifyouhaveanyquestionstoask,pleasecometomyoffice.如果你有问题要问的话，请到我办公室来。,2.条件状语从句,引导状语从句的连接词有:,If,unless,aslongas,incase,providedthat,onconditionthat,If-如果,Ifyoudonthurryup,youwillmisstheplane.,Ifitsnowstomorrow,theflightwillbecanceled.,Ifyouleaveat6oclocktomorrowmorning,youdbettergettobednow.,Unless-如果不,除非=ifnot,Wecantgetthereontimeunlesswebooktheearliestflight,=Wecannotgetthereontimeifwedontbooktheearliestflight.,Donttroubletroubleunlesstroubletroublesyou.,Hewillnotjoinusunlesshechangeshismind.,Aslongas-只要,Wewillsucceedaslongaswekeepontrying.,Youcantplaygamesaslongasyouremembertherules.,Amanisnotoldaslongasheisseekingsomething.,As(so)faras-据所知,AsfarasIknow,hespeaksEnglishverywell.,As/SofarasIknow,heisanexpertonDNA.,Incase-假使,如果,Theplanecannottakeoffincaseitrains.,Sendusamessageincaseyouhaveanydifficulty.,Providedthat如果,有时省略that,Theplanewillbeingoodconditionprovidedthatitistakencareofcarefully.,Youcanbecomeastewardessprovidedthatyouareingoodshapeand