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It’s10:08It’slovelyItweighsonly3kilosIt’salargesumofmoneyI.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weather、time、distance、environment等Itwasveryquietinthecafé.Itishalfanhour’swalktothecity.3.指示代词指代this或thatThisisyourpen,isn’tit?What’sthatonthedesk?Iguessitmightbearobot.TheParkersboughtanewhousebut___willneedalotofworkbeforetheycanmovein.A.theyB.itC.oneD.which2.We’vebeenlookingathousesbuthaven’tfound___welikeyet.A.oneB.onesC.itD.themBthehousethattheParkersboughtAahouse1.Itwashisdutytotakecareoftheorphans.2.It’shelplesstryingtoconvinceher.3.It’seasyforhimtolearnEnglish.4.Itdoesn’tmatterwaitingafewmoredays.5.Itisnaturalthattheyhavedifferentviews.6.Ithappenedthatshewasn’tinthatday.tododoingclauseIt’simportantforustodosportsItisobviousthatgoingforsportswilldoalotofgoodtoyourhealth.…possibleItis/was+adj.necessary+(forsb.)todosth.important…/clause知道自己的缺点是很重要的。Itisimportanttoknowyourshortcomings.大学生有必要至少掌握一门外语。Itisnecessarythatacollegestudent(shouldmaster)atleastaforeignlanguage.形式主语运动是很重要的It’sapitythattheChineseteamdidn’tattendtheWorldCup.…one’sdutyIt+is/was+n.one’shope+clauseanhonor…/(forsb.)todosth.他居然还活着,真是个奇迹。Itisawonderthatheisstillalive.手边有个小笔记本是个好主意。Itisagoodideatohavealittlenotebookhandy.…saidItis/wasp.p.known+that-clausebelieved…1.Thetwosidesaresaidtohavereachedanagreement.It’ssaidthatthetwosideshavereachedanagreement.2.据说这位电影明星已经到了杭州。ItisreportedthatthemoviestarhasarrivedinHangzhou.Ithappens(seems，appears)that...碰巧,那年的收成不好Ithappenedthattheharvestwasbadthatyear.It+is/was+nogood+doingsth.nouse想追我?没门！覆水难收。It’snousecryingoverspiltmilk…possibleItis/was+adj.necessary+(forsb.)todosth./clauseimportant……one’sdutyIt+is/was+n.one’shope+clause/(forsb.)todosth.anhonor……saidItis/wasp.p.known+that-clausebelieved…形式主语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;1指的是形式宾语it；2指的是宾补的两种形式：3指的是真正宾语的三种形式：Wethinkitourdutytocleanourclassroomeveryday.HefeltitimportantlearningEnglishwell.Theyfounditdifficultthattheywouldfinishtheirworkintwodays.think,believe,make,find,consider,feel形容词或名词；不定式短语，动名词短语或从句1.S+v.+it+adj.+(forsb.)todosth.n./clause形式宾语1.我发现学英语非常有趣。IfinditveryinterestingtostudyEnglish.2.他非常清楚地表示他对那门学科不感兴趣。Hemadeitclearthathewasnotinterestedinthissubject.think,make,find,consider,feel3.我们认为帮助灾区的人民抗风雪暴是我们的职责。Wefeelitourdutytohelpthepeopleindisaster-hitareastofightagainstthesnowstorm.ItwaswithastrongbeliefthatMartinLutherkingledmanymovements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...Ididn'tgotobaduntil10o’clockyesterdayevening.Itwasnotuntil10o’clockyesterdayeveningthatIwenttobad.Ididn’trealizeshewasafamousfilmstaruntilshetookoffherdarkglasses.ItwasnotuntilshetookoffherdarkglassesthatIrealizedshewasafamousfilmstar.It常用句型：1.It+be+一点时间+when…（时间状语）2.It+be+一段时间+since…3.It+be/willbe+一段时间+before(过多久后才…)It+be(not)+一段时间+before…(没过多久就…)4.Itistimetodo/that…(v.过去时态或shoulddo）5.It+be+thefirsttimethat…(谓语用完成时态）1.Itistwoyears_______helivedhere.2.Itwillbetwoyears_______shemovestoanewhouse.3.ItwasChristmasEve______Igotthenewsofhisbeingkilledinacarcrash.4.Itisthefirsttimeinhistory______twoNobelPrizeshavebeenawardedtothesameperson.5.Itwon’tbelong_______youregretwhatyouhavedone.6.Itistime______wegavethehouseathoroughcleaning.sincebeforethatbeforethatwhen在一些固定用法中考查常见的固定用法有:makeit成功，安排在或定在某时间forgetit别提了，忘了它吧Don’tmentionit别提了，表示不用谢Itdoesn’tmatter没关系It(That)depends视情况而定Youguessedit你猜着了It’shardtosay很难说It’suptoyoutodosth.由你来决定做某事①Itisnevertoooldtolearn.活到老,学到老。②Itiseasiertofallthantorise.摔倒容易爬起来难。③Itisnousecryingoverspilt(溢出的)milk.覆水难收。④Itneverrainsbutitpours(泼水).不鸣则已,一鸣惊人。Proverbs(谚语)with“It”⑤Itiseasytoopenashopbuthardtokeepitalwaysopen.创业容易守业难。⑥Ittakesthreegenerations(代)tomakeagentleman.十年树木,百年树人。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’sgenerall