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导学案ByLiangYuThestructuresofITTeachingkeypoints Getthestudentstomasterthestructuresthathavebeenlearnedbefore.Teachingdifficultpoints Howtomakethestudentsunderstandandusethesestructuresinthefuturestudy.it是中学英语中“曝光率”极高,搭配能力极强的一个词对于高中生来讲,掌握it的用法不但要从词法的角度去考虑,更应将重点放在其构成的句型方面Teachingprocedure:StepILeading-inbyafewexercisesStepIIThestructuresofIT
(一)ItisusedasformalsubjectItisnouse+doingsth此句型中的it是形式主语,其后的动名词短语是真正的主语适用于这种结构的词还有uselessgood等例如Itisnousetalkingabouttheaccidentthattookplaceonthestreet.只是•味地谈论发生在大街上的那场事故是亳无用处的Itis+adj+forsbtodosth此句型中的forsbtodosth是不定式的复合结构,它是形式主语it所代表的真正主语常见的形容词有difficulteasyhardimportantimpossiblenecessarypossible等例如:NowitispossibleforJimtogetoverthedifficulty.为于吉姆来说,渡过难关是极有可能的Itisnoteasyforustoinasteraforeignlanguagewell.对于我们来说,精通一门外语不是一件容易的事Itis+adj+ofsbtodosth此句型中的ofsbtodosth也是不定式的复合结构,常见的形容词有kindbraveclevernicegoodstupidsillycarefulnaughty等例如Itisverywarm-heartedofyoutoshowmehowtogototherailwaystation.谢谢你告诉我去火车站的路,你真是个热心人Itissostupidofhimastobelievethecheat.他竟然如此愚蠢去相信那骗子的话Ittakessbsometimemoneyenergytodosth此句型的意义为“为做花费类似句型有sbspend…indoingsth;例如Iltookhimhalfanhourtoworkoutthedifficultmathsproblem.解出那道数学难题花了他半个小时的时间+be+n/adj/v-ed+that从句该句型中it为形式主语•,that引导主语从句that在句中无实际意义,只起连接作用,在句中不充当成分,但不可省略例如ItisafactthatEnglishisbeingacceptedasaninternationallanguage.英语正在被人们视为国际通用语言,这是不争的事实二ItisusedasrealsubjectIt+be+一段时间+since从句从句型中,如果从句中的动词为延续性动词的一般过去式,意为“自从该动作结束以来已多久了”;如果从句中的动词为非延续性动词,则表示“自从该动作开始以来已多久了”例如IlisyearssinceIworkedinFuzhou.IthasbeenquiteafewyearssincehecametoChina.他来中国己有很多年了It+be...when从句该句型中when前是表示时间点的名词,该名词作表语,when充当从属连词引导时间状语从句,意思是“当……时而在力门5/\皿5+强调部分+小凯(亚110)”从句中,如果对时间状语进行强调,其前通常要加介词例如Itwasnineoclockinthemomingwhentheywenttowork.当他们上班时已经是上午九点了ItwasatsevenintheeveningthatIwenttothedinner.我去赴宴是在晚上七点It+bc...before从句该句型中before引导的是时间状语从句,从句中若要表示将来时间就用一般现在时代替将来时常用于before前的词语有longnotlongyearsmonthsdayshoursminutes等其肯定式表示“过多久就/才否定式表示“没多久……就/才例如Itwillbehoursbeforehearrivesattherailwaystation.他到火车站得好几个小时ItwasnotlongbeforeIleftthesouth.不久以后我就离开了南方一Itisusedasformalobjectsb+v+it+adj/n+todosth/doingsth/从句在这种结构中,it是形式宾语,此结构中常见的动词有believemakeregardconsidersupposefeelthinkfindimagine等例如Hefeltitanhonourtobeinvitedtospeakatthemeeting.他觉得能在大会上发言是•种荣幸四ItisusedinemphaticstructureItis/was+强调部分+thatwho从句Summary summarizethestructuresofIT.Practice:HomeworkIspossibletoflytothemooninaspaceshipA.nowBmanCthatDitWasitduringheSecondWorldWarhediedAthatBwhileCinwhichDthenIdontthinkpossibletomasteraforeignlanguagewithoutmuchmemoiywork.AthisBthatCitsDitDoesmatterifhecantfinishthejobontimeAthisBthatCheDitItwasnotshetookoffherdarkglassesIrealizedshewasafamousfilmstar.Awhen;thatBuntil;thatCuntil;whenDwhen;thentookusoveranhouralongthestreet.A.walkwalkwasabout600yearsagothefirstclockwithafaceandanhourhandwasmade.AthatBuntilCbeforeDwhenIhatewhenpeopletalkwiththeirmouthsfull.AitBthatCtheseDthemWasthatIsawlastnightattheconcertAityouBnotyouCyouDthatwasthroughJackMarygottoknowBob.AwhoBwhomChowDthathasbeenthreemonthshesmoked.peoplenowmakearuletobuycardsforheirfriendsbeforeChristmas.dontknowmakesherafraidofhavingherbusinessdiscusseditisthatisitwhatisitthatiswhatmettheEnglishmanitwasthatitwasthatwasitthatwashatsthesecondtimeyoulatethisweek.arrivedarrivedwillnotbewcmeetagainbeforelongafteraftersdemandedthatwethereonfoot.togo*tgogotgosnouseoverspiltmilk.youcryyoutocry。