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Theuseof“it”(I)1.It’sasmallworldafterall.3.It’safineday,isn’tit?2.Abirdlandedonthetree.It’ssinging.4.Whattimeisit?It’sseveno’clock.5.Thebabyiscrying.Itmightbehungry.this/thatI.人称代词a.用作人称代词，代替前文提到过的事物，以避免重复:b.也可以指动物或婴儿(未知性别的婴儿或孩子):2.非人称代词有时并不指具体的东西，可指天气、时间、距离、环境等Itwasveryquietinthecafé.Itishalfanhour’swalktothecity.3.指示代词指代this或thatThisisyourpen,isn’tit?What’sthatonthedesk?Iguessitmightbearobot.Itisobviousthatgoingforsportswilldoalotofgoodtoyourhealth.It’sapitythattheChineseteamdoesn’tattendtheWorldCupinSouthAfricathisyear.4.it作形式主语(PreparatorySubject)代替不定式，动名词或从句所表示的真正主语。Peoplebelievedthatthemandid’ttellalie.It’sbelievedthatthemandid’ttellalie.Thetwosidesaresaidtohavereachedanagreement.It’ssaidthatthetwosideshavereachedanagreement.TheswordhasbeenprovedtodatefromQinDynasty.IthasbeenprovedthatthesworddatedfromQinDynasty.HowearlymanwasabletoconstructStonehengeisamystery.It’samysteryhowearlymanwasabletoconstructStonehenge.it作形式主语的句型常见的有：Itisclear(obvious，true，possible，certain....)thatItissaid(reported，believed....)that...Itissuggested(ordered/demanded/insisted/commanded...)that...从句用虚拟语气Itisapity(shame/duty/fact/honor/nosurprise...)that...Ithappens(seems，looks，appears)that....Itdoesn’tmatter(nowonder…)+wh-/how-clauseIttakessb....todosth…Itisnogood(use)doingsth…Itlooks(seems)asif...归纳5.作形式宾语(PreparatorySubject)为了记忆方便我们把该句型总结为6123结构。6指主句中常用的动词：think,believe,make,find,consider,feel；1指的是形式宾语it；2指的是宾补的两种形式：形容词或名词；3指的是真正宾语的三种形式：不定式短语，动名词短语或从句。Wethinkitourdutytocleanourclassroomeveryday.HefeltitimportantlearningEnglishwell.Theyfounditdifficultthattheywouldfinishtheirworkintwodays.ItwaswithastrongbeliefthatMartinLutherkingledmangmovementsagainstracialdiscrimination.6.用于强调结构（emphaticstructure）Itis/was+被强调部分+that/who...+其他成分ImetTominthestreetyesterday.强调结构的一般疑问句型：Is/was+it+所强调的部分+that/who…?WasityouthatmetTominthestressyesterday?强调结构的特殊疑问句型：疑问词+is/was+it+that/who…?Whowasitthatyoumetinthestreetyesterday?WherewasitthatyoumetTomyesterday?...not…until….句式用于强调句型要注意否定词not前移构成：Itis/wasnotuntil+被强调部分+that...Idid’tgotobaduntil10o’clockyesterdayevening.Itwasnotuntil10o’clockyesterdayeveningthatIwenttobad.Ididn’trealizeshewasafamousfilmstaruntilshetookoffherdarkglasses.ItwasnotuntilshetookoffherdarkglassesthatIrealizedshewasafamousfilmstar.3.Itisnouse(和他们争论这一问题),youaresimplywastingtime.(argue)6.Hisparentsmanageedto(使…成为可能)forhimtogoabroad.(possible)4.______（不要紧/没关系）whetherwegotogetherorseparately.(matter)7.Accordingtothewitnesses,itwasattwoo’clock(该事故发生).(happen)1.(正在下雨)whentheyleftthestation.(rain)2.(对他来讲很困难)tostudytwolanguages.(difficult)8.(正是在这片耕地上)thatthefarmersproducefoodforthewholepopulationofChina.(arable)10.It(直到他们联手)thattheyachievedtheirgoals.(join)9.It(直到1920年)thatregularradiobroadcastsbegan.(until)5.(普遍认为)thatChina’sfastdevelopmentineconomywillbenefitmanycountriesintheworld.(generally,believe)1.Itwasraining2.It’sdifficultforhim3.arguingwiththemaboutthisquestion4.Itdoean’tmatter5.It’sgenerallybelieved6.makeitpossible7.thatthisaccidenthappened8.Itisonthisarableland9.wasnotuntil192010.wasnotuntiltheyjoinedhands