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It作形式主语教学设计动词不定式,动名词或主语从句作主语时,通常把它们放在谓语动词前,而用it作形式主语,放到句首,常见句型有:1.It+be+形容词+主语从句,如:ItisuncertainwhetherhecancometoJenny’sbirthdaypartyornot.2.It+be+名词词组+主语从句,这类名词有:afact,apity,ashame,anhonour,aquestion等,如:It’sapitythatyoumissedtheexcitingfootballmatch.Itremainsaquestionwhetherhewillcomeornot.3.It+be+过去分词+主语从句,这类过去分词有:announced,believed,expected,hoped,decided,reported,said,shown等,如:Itisreportedthat16peoplewerekilledintheearthquake.Itisnotdecidedwhowillgivetheoperationtothepatient.4.It+不及物动词(seem,appear,happen等)+主语从句,这类不及物动词有:appear,happen,seem等,如:Itseemedthathedidn’ttellthetruth.IthappenedthatIwasoutwhenhecalled.5.It+be+形容词+forsb.)+动词不定式这类句型常用形容词easy,difficult,hard,important,possible,wise等作表语,有时候为了强调不定式动作的执行者,常在不定式前加forsb,如:It’snecessaryfortheyoungtomastertwoforeignlanguage.Itisunwisetogivethechildrenwhatevertheywant.这类形容词有:easy,difficult,hard,important,possible,wise6.It+be+形容词+ofsb.+动词不定式,这类形容词常是表示心理品质,性格特征的形容词,如:kind,nicestupid,clever,foolish,polite,impolite,silly,selfish,considerate等。某人和这些形容词可以构成主系表结构。如:It’sverykindofyoutohelpmewiththework.=Youarekindtohelpme.Itseemedselfishofhimnottosharehisdictionarywithothers.=Heseemedselfishnottosharehisdictionarywithothers.7.It+be+名词词组+动词不定式,如:Itisnotagoodhabittostayuptoolate.8.It+be+名词或形容词+动名词,这类名词和形容词常常是:good,nogood,nouse,awasteof,useless,senseless等,如:It’sawasteoftimetalkingtoheranymore.Itisnousearguingaboutthematterwithhim.9.It+take(sb.)+时间(金钱)+动词不定式,如:Ittooktheworkersalmostthreeyearstofinishbuildingthedam.Itwilltakeawholedaytogettothetopofthemountainonfoot.鉴于it做形式主语有这如此多用法,我对微课教学设计做出如下安排:TeachingTopic:Itisusedastheformalsubject.Teachinggoals:Enablestudentstograsptheformalsubject.Enablestudentstoknowhowtheformalsubjectcomes.Enablestudentstounderstandthisgrammaranduseitfreely.Teachingkeypointsanddifficultpoints:Keypoints:Knowthatitcanreplacethesubjectclauseasthesubject.Difficultpoints:InthestructureIt+be+pastparticiple+subjectclause,ifthepastparticipleisadvised,suggestedororderedandsoon,thesentencemustusethesubjunctivemood.TeachingProcedures:Useasentence:Thatourschoolwillholdafootballgameisknowntoustoleadtheformalsubjectit.Throughtheexplanationandpicture,letstudentsunderstanditandknowthatitdoesn’thaverealmeaninginthisstructure.Thenshowfivekindsoftheusageoftheformalsubjectit.It+be+adj.+thesubjectclause.Inthispart,Imakethelistofmanyadjectivesthatarealwaysusedinthissentencepattern.ThenIuseaChinesesentenceandapicturetoleadstudentstoputthisstructureintouse.It+be+nounphrases+thesubjectclause.Inthispart,Imakethelistofmanynounphrasesthatarealwaysusedinthissentencepattern.ThenIuseaChinesesentenceandapicturetoleadstudentstotranslateasentenceusingthisstructure.It+be+thepastparticiple+thesubjectclause.Imakethelistofmanypastparticiplesthatareusedinthissentencepattern.Thenuseasentenceandapicturetoshowit.ThenIemphasizethesubjunctivemoodthatexistsinthisstructure.It+be+vi+thesubjectclause.Makethelistofmanyintransitivesusedinthisstructure.Iuseasentenceandapicturetomakestudentsunderstandwhattheyhavelearnedbetter.It+be+transitiveverbs+thesubjectclause.Makethelistofsometransitiveverbs.Useasentenceandapicturetomakestudentsunderstandthissentencepatternwell.3.SummarySummarizethefivekindsoftheusagetheformalsubject.实战演练:1.Itisgenerallyconsideredunwisetogiveachildheorshewants.(NMET1997)A.howeverB.whateverC.whicheverD.whenever2.Infactisahardjobforthepolicetokeeporderinanimportantfootballmatch.(2001上海)A.thisB.thatC.thereD.it3.isafactthatEnglishisbeingacceptedasaninternationallanguage.(NMET1995)A.ThereB.ThisC.ThatD.It4.Isnecessarytotakeoffourshoeswhenweenterthelab?(MET88)A.everyoneB.thisC.herD.it5.________willtakeyoualotoftimetofindhiminthecrowd.A.ItB.IC.WeD.They6.Itisnousehis_________there,thesituationishopelessnow.A.togoB.tobegoingC.goingD.havinggone7.Itisnevertoolatetolearn,________?A.isitB.isn’titC.doesitD.doesn’tit8.___________isknowntoallthatShenzhouVILaunchedSuccessfully.A.AsB.WhatC.ItD.That9._______isreportedinthenewspaper,theEarthquakeineastChina'sJiangxiProvincekilled13peopleA.ItB.AsC.ThatD.What10.___________certainthathisinventionwillmakepeople’slifeconvenient.A.That’sB.ThisisC.It’sD.What’s11._________thatthereisanotherfootballmatchontheairthisevening.A.Itsays
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