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语法辅修刘爽2Strength&courageIttakesstrengthtofitin.Ittakescouragetostandout.Ittakesstrengthtofeelafriend'spain.Ittakescouragetofeelyourownpain.Ittakesstrengthtohideyourownpain.Ittakescouragetoshowthem.Ittakesstrengthtosurvive.Ittakescouragetolive.适应环境需要力量。与众不同需要勇气。感觉朋友的痛需要力量。感觉自己的痛需要勇气。隐藏自己的痛需要力量。展示自己的痛需要勇气。生存需要力量。生活需要勇气。It作形式主语动词不定式，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。2/24/2020It作形式主语1.It+be+形容词+主语从句•ItisuncertainwhetherhecancometoJenny’sbirthdaypartyornot.2/24/2020It作形式主语2.It+be+名词词组(+forsb.)+主语从句这类名词有：afact,apity,ashame,anhonor，aquestion等。•It’sapitythatyoumissedtheexcitingfootballmatch.•Itremainsaquestionwhetherhewillcomeornot.2/24/2020It作形式主语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。•Itisreportedthat16peoplewerekilledintheearthquake.•Itisnotdecidedwhowillgivetheoperationtothepatient.2/24/2020It作形式主语4.It+不及物动词(seem,appear,happen,occur等)+主语从句•Itseemedthathedidn’ttellthetruth.•IthappenedthatIwasoutwhenhecalled.•ItneveroccurredtomethatIwouldtraveltoAmerica.•Itappearsthattheywon'tbeabletocomeatall.2/24/2020It作形式主语5.It+be+形容词+（forsb.）+动词不定式•常用形容词easy,difficult,hard,important,possible，wise等作表语•It’snecessaryfortheyoungtomastertwoforeignlanguages.•Itisunwisetogivethechildrenwhatevertheywant.2/24/2020It作形式主语6.It+be+形容词+ofsb.+动词不定式•形容词：kind,nicestupid,clever,foolish,polite,impolite,silly,selfish,considerate等•It’sverykindofyoutohelpmewiththework.=Youarekindtohelpme.•Itseemedselfishofhimnottosharehisdictionarywithothers.•=Heseemedselfishnottosharehisdictionarywithothers.It作形式主语•7.It+be+名词词组+动词不定式，如：•Itisnotagoodhabittostayuptoolate.2/24/2020It作形式主语8.It+be+名词或形容词+动名词，•名词和形容词：good,nogood,nouse,awasteof,useless,senseless,nohope,hopeless等•It’sawasteoftimetalkingtoheranymore.•Itisnousearguingaboutthematterwithhim.2/24/2020It作形式主语•9.It+take(sb.)+时间（金钱）+动词不定式•Ittooktheworkersalmostthreeyearstofinishbuildingthedam.•Itwilltakeawholedaytogettothetopofthemountainonfoot.2/24/2020练习题1.Infact，isahardjobforthepolicetokeeporderinanimportantfootballmatch.A.thisB.thatC.thereD.it2/24/2020It+be+名词词组（+forsb.）+动词不定式D练习题2.Itisnevertoolatetolearn,________?A.isitB.isn’titC.doesitD.doesn’tit2/24/2020BIt+be+形容词+动词不定式练习题3.isafactthatEnglishisbeingacceptedasaninternationallanguage.A.ThereB.ThisC.ThatD.It2/24/2020It+be+名词词组+主语从句D练习题4.________willtakeyoualotoftimetofindhiminthecrowd.A.ItB.IC.WeD.They2/24/2020It+take(sb.)+时间（金钱）+动词不定式A练习题1.(1)______isknowntousallisthatEnglishisausefullanguage.(2)______isknowntousall,Englishisausefullanguage.(3)_____isknowntousallthatEnglishisausefullanguage.A.ItB.WhatC.ThatD.As2/24/2020BDAIt+be+过去分词+主语从句练习题2.(1)Itiskind_______________youtodoso.(2)Itiseasy_______________youtodoso.A.toB.forC.ofD.with2/24/2020CBIt+be+形容词+forsb.+动词不定式It+be+形容词+ofsb.+动词不定式练习题3.(1)_________isafactthatEnglishisbeingacceptedasaninternationallanguage.(2)_________isnoneedforustodiscusstheproblemagainsinceithasalreadybeensettled.(3)_________isunnecessaryforyoutoexplainittousanymore.A.ThisB.ThatC.ItD.There2/24/2020CDCIt+be+名词词组+主语从句It+be+形容词+（forsb.）+动词不定式以It开头的句型以it开头的句型1.it+特定动词+asif从句•特定动词：appear,seem等。•Itappearsasifyouareverytired.2/24/2020以it开头的句型2.ithasbeen/is+一段时间+since从句ItissixyearssinceIbegantoworkhere.IthasbeensixyearssinceIworkedhere.2/24/2020以it开头的句型3.it+be+一段时间+before从句Itwon’tbealongtimebeforewefinishcooking.Itwasfourdaysbeforetheyfoundthelostchild.2/24/2020以it开头的句型4.itis(high)time+that从句=itis(high)timeforsb.todosth•从句谓语要用一般过去时，也可用shoulddo•ItishightimethatIwenttoseemymotherinthehospital.•Itistimeforyoutodoyourhomework.2/24/2020以it开头的句型5.itis/was+强调内容+that/who从句ItisinthestreetthatIcameacrossMr.Li.Itwasmyfriendwhopickedmeupatthestation.2/24/2020练习题1.(1)Itwaseighto’clock__________helefthere.(2)Itisateighto’clock__________hewillleavehere.(3)Itiseighthours__________helefthere.(4)Itwillbeeighthours__________wemeetagain.A.whenB.thatC.beforeD.since2/24/2020ABDC练习题2.(1)It’sgood_______youtotakeawalkaftersuppereveryday.(2)Itwasreallystupid_______himtorefusetheinvitation.A.ofB.toC.forD.at2/24/2020CA练习题3.(1)WasitonNov.lst,__________thefamousscientistwasborn?(2)WasitNov.1st,_____________thefamousscientistwasborn?A.inwhichB.onthatC.thatD.when2/24/2020CD练习题4.(1)Itisabouttendays__________hereturnedhome.(2)Itwastendaysago__________helefthome.A.beforeB.thatC.sinceD.when2/24/2020CD练习题5.(1)ItwasnotuntilIhadreadyourletter________thetruth.(2)NotuntilIhadreadyourletter___________thetruth.A.didIlearnB.Ididn’tlearnC.thatIlearnedD.thatIhadlearned2/24/2020CA练习题2/24/2020有必要把这一切都告诉他父亲吗?熬夜没有好处。很显然，他读过这本书。他说什么没关系。Isitnecessarytotellhisfathereverything?It’snogoodsittinguptoolate.Itisquiteclearthathehasreadthebook.Itdoesn’tmatterwhathesays.It作形式宾语当不定式（短语）、动名词（短语）或从句在某个句子中作宾语时，常用it作形式宾语.It作形式宾语•有宾语补足语的情况2/24/2020It作形式宾语•⒈it代替不定式短语表示“感觉”/“看待”的动词…+it+形容词/名词+不定式短语•Ifinditpleasanttoworkwithhim.•Theyfeltitdifficulttofinishtheworkinsuchashorttime.•Shethinksitherdutytohelpus.•Ithinkitmyhonortobeinvitedtospeakhere.•Tomdidn’tfinditdifficulttowritelettersinChinese.•Allthesenoisesmadeitimpossibleformetogoonwiththework.2/24/2020I