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-.It作形式主语常见句型动词不定式,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,it作形式主语时没有具体的意义常见句型有l.lt+be+形容词+主语从句如ItisuncertainwhetherhecancometoJennysbirthdaypartyornot.
2.lt+be+名词词组+主语从句这类名词有:afactapityashameanhonourItsapitythatyoumissedtheexcitingfootballmatch.LItremainsaquestionwhetherhewillcomeornot3Jt+be+过去分词+主语从句,这类过去分词有:announcedbelievedexpectedhopeddecidedreportedsaidshown等,如Itisreportedthat16peoplewerekilledintheearthquake.Itisnotdecidedwhowillgivetheoperationtothepatient.
4.lt+不及物动词seemappearhappen等+主语从句,这类不及物动词有:appearhappenseem等,如VItseemedthathedidnttellthetruth.IthappenedthatIwasoutwhenhecalled.5』t+be+形容词+forsb.+动词不定式这类句型常用形容词easy’difficulthardjmportantpossiblewise等作表语,有时今日候为了强调不定式动作的执行者,常在不定式前加forsb如这类句型常用形容词easydifficulthardimportantpossiblewise等作表语,候为了强调不定式动作的执行者,常在不定式前加forsb如Itsnecessaryfortheyoungtomastertwoforeignlanguage.Itisunwisetogivethechildrenwhatevertheywant.这类形容词有:casydifficulthardimportantpossiblewise
6.lt+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:kindnicestupidzcleverzfoolishpoliteimpolitesillyselfishconsiderate来后等某人和这些形容词可以构成主系表结构如Itsverykindofyoutohelpmewiththework=Youarekindtohelpme.Itseemedselfishofhimnottosharehisdictionarywithothers.=Heseemedselfishnottosharehisdictionarywithothers.7Jt+be+名词词组+动词不定式,如Itisnotagoodhabittostayuptoolate.
8.lt+be+名词或形容词+动名词,这类名词和形容词常常是:goodnogoodnouseawasteofuselesssenseless等,如Itsawasteoftimetalkingtoheranymore.Itisnousearguingaboutthematterwithhim.91t+takesb.+时间金钱+动词不定式,如:Ittooktheworkersalmostthreeyearstofinishbuildingthedam.Itwilltakeawholedaytogettothetopofthemountainonfoot.tisgenerallyconsideredunwisetogiveachildheorshewants.A.howeverB.whateverC.whicheverD.whenevernfactisahardjobforthepolicetokeeporderinanimportantfootballmatch.A.thisB.thatC.thereD.itisafactthatEnglishisbeingacceptedasaninternationallanguage.A.ThereB.ThisC.ThatD.ItIsnecessarytotakeoffourshoeswhenweenterthelabA.everyoneB.thisC.herD.it
5.willtakeyoualotoftimetofindhiminthecrowd.A.ItB.IC.WeD.They
6.Itisnousehistherethesituationishopelessnow.A.togoB.tobegoingC.goingD.havinggone
7.ItisnevertoolatetolearnA.isitB.isntitC.doesitD.doesntit
8.isknowntoallthatShenzhouVILaunchedSuccessfullyA.AsB.WhatC.ItD.That
9.isreportedinthenewspapertheEarthquakeincastChinasJiangdProvincekilled13peopleA.ItB.AsC.ThatD.What.certainthathisinventionwillmakepeopieslifeconvenient.A.ThatsB.ThisisC.ItsD.Whats.thatthereisanotherfootballmatchontheairthisevening.A.ItsaysB.ItwassaidC.ItissaidD.Whatwassaid.thattheirdaughtergotanopportunitytostudyabroad.A.ItsaexcitingnewsB.ThisisanexcitingnewsC.ThisisexitingnewsD.Itsexcitingnews参考答案1-5BDDDA6-10CACAC11-12CD二.it作形式宾语时,可以代替三种形式:不定式、动名词和宾语从句it作形式宾语时,需具备两个条件:
①真正的宾语是不定式、动名词或从句2有宾语补足语具备了这两个条件,形式宾语it一定要用l.it代替不定式短语think/find/feel/consider/make/regard…+it+形容词/名词+不定式短语Ifindit_pleasanttoworkwithhim.Theyfeltitdifficulttofinishtheworkinsuchashorttime.Allthesenoisesmadeitimpossibleformetogoonwiththework.
2.it代替动名词短语这只限于少数句型,在多数情况下用不定式时更多一些
①Theprofessorconsidersitnogoodreadingwithoutunderstanding.这位教授认为|阅读而不理解没有益处
③Hefoundituselessnousearguingwithhim.@Hethoughtitabsolutelysenselessattemptingtheimpossible.
3.it代替宾语从句Weallthoughtitapitythattheconferenceshouldhavebeencancelled
②Itookitforgrantedthattheywerenotcoming.我想他们准是不会来的了IIIseetoitthateverythingisreadyintime我负责使一切都按时准备好
三、形式主语、形式突语零项练习
1.Itseasierthan_A.say;doB.tosaytodoC.saysdoesD.sayingdoingttakesme30minutestoschoolbybikeeverydayA.goingB.togoC.goesD.goItsnoteasyus_aforeignanguage.A.for;learningB.of;learningC.of;tolearnD.for;tolearnChildrenfind_interestingtoplaycomputergames.A.thatB.whichC.itD.itsDoyouthinkitimportant_computerwellA.playB.playsC.toplayD.playingIsnecessarytocompletethedesignbeforeNationalDayA.thisB.thatC.itD.he
7.1dontthinkpossibletomasteraforeignlanguagememorywork.A.thisB.thatC.itsD.it
8.DoesmatterifhecantfinishthejobontimeA.thisB.thatC.heD.it
9.Tomsmotherkepttellinghimthatheshouldworkharderbutdidnthelp.A.heB.whichC.sheD.it
10.isafactthatEnglishisbeingacceptedasaninternationallanguage.A.ThereB.ThisC.ThatD.It
11.1hatewhenpeopletalkwiththeirmouthsfullA.itB.thatC.theseD.them
12.llikeintheautumnwhentheweatherisclearandbright.A.thisB.thatC.itD.one.happenedheisunfitfortheoffice.A.This;thatB.That;thatC.lt;thatD.He;that.Wetookforgrantedthattheywouldacceptouradvice.A.thatB.thisC.itD.them.thatthescientistwillgiveusatalknextmonthA.IstrueB.IsittrueC.ItstrueD.ltJstruly.doesntmattermuch_dressyouaregoingtowear.A.This;thatB.That;whoC.It;whichD.It;who._isgoingtoAmericaforfurtherstudy.A.HeissaidthatB.PeoplesaidthatheC.ItwassaidheD.Itissaidthathe
18.Theyaregoodfriends.isnowonderthattheyknoweachothersowell.A.ThisB.ThatC.ThereD.It.1spossibletoflytothemooninaspaceshipA.thisB.thereC.thatD.it.Shelikedwhenhekissedher.A.himB.thatC.oneD.it._willdoyougoodtodosomeexerciseeverymorning.A.ItB.ThereC.ThoseD.One.Wethink_ourdutytopaytaxestoourgovernment.A.thatB.thisC.itsD.it.Tdappreciate_ifyouwouldliketoteachmehowtousethecomputer.A.thatB.itC.thisD.you.-WhatdoyouthinkmadeMarysoupset・hernewbicycle.A.AsshelostB.LostC.LosingD.Becauseoflosing.Itsverykindyoume..A.for;helpingB.ofhelpC.fortohelpD.oftohelp-Whatdoyouthinkofthebook-Ohexcellent.Itsworth_asecondtime.A.toreadB.tobereadC.readingD.beingread28・Itsnouse_forwardto_fromhersoon.A.tolook;tohearB.looking;hearingC.looking;hearD.look;hearttooktheworkmenonlytwohourstofinishmycar.A.repairingB.repairC.torepairD.repaired
30.cleanisasafeguardagainstdisease.A.TobekeepingB.KeptC.KeepD.Keeping参考答案1-5BBDCC6-10CDDDD11-15ACCCB16-20CDDDD21-24ADBC26-30DCBAD。