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Grammarit的用法I.人称代词II.形式主语；形式宾语III.用于强调句型中it作人称代词1.Thefrogisnotawarm-bloodedanimal.It’sacold-bloodedone.1.用于指刚提到的事物，以避免重复。2Mypenismissing.Ican’tfind_____.3Theadolescentisgainingweight,and_____worrieshisparents.4.---Sorry,sir.Thereisonlyonebluetieavailable.Take_____?---No,thanks.Ipreferablack_______.ititwhichitone2.用于指代人2)指代说话者不太清楚的那个人，常用在打电话和敲门时。e.g.—Whoisknockingatthedoor？—_____isme.1)性别不明时Lookatthepoorbaby.____iscryingagain.ItIt3.代替指示代词that,this—Whosepillisthis？—_____ismine.——Who’sthatoverthere?——____Helen.ItIt’s4.用来表示时间、天气、距离、自然环境，地点、温度；抽象的环境.1)It’shalfpastfivenow.2)It’sgettingfreezingcold.3)It’s10minutes’drivetothepostoffice?4)Itwasveryquietatthemoment.5)Howisitgettingalong?(time)(weather)(distance)(environment)(situation)it作形式主语、形式宾语1.做形式主语1)不定式It+be+adj.+for(of)sb.+todo…；ItisimportantforyoutolearnEnglishwell.It'sgenerousofyoutodonatesuchalargeamountofmoneytocharity.It+be+名词+todo…e.g.Itisagoodideatoquitsmokingbeforeonebecomespregnant.没有见到那位学者本人真可惜！Itisapity/shamenottoseethatscholarintheflesh.be+介词短语；ItisagainstthelawtosellcigarettestoadolescentsinBritain.其他类型的谓语Itgivesmegreatpleasuretoseeamovie.Ittakescarefulpreparationstopassajobinterview.2)动名词Itbe+nogood/nouse/useless/worth/fun/awasteof…+doing…ItismuchfunworkingforGoogle.Intheopinionofmanyteachers,itisawasteoftimeplayingcomputergames.Itisnousecryingoverspiltmilk.3)主语从句aIt+be+adj.+that…Itiscertainthateverythingwillworkoutsuccessfullyduetoourhardwork.Itisstrangethatheshouldnotfeelashamedofhisbehavior.Itisstrange/surprising/important/necessary,+that+S+should+do…bIt+is+n.+that…e.g.Itisapity/shamethatheshouldgetintothehabitofabusingalcohol._________________thatyouarebreathless;youhavebeenwalkingforhours.ItisnowondercIt+is+said/reported/believed/knowntosb…that…e.g.Itissaidthatthebookhasbeentranslatedintoseverallanguages.It+is+suggested/ordered/required/insisted…thatS+(should)+do…Itissuggestedthatthestudents(should)builduptheirstrength.也可能是wh-词引导的Itisstillaquestionhowmanypeoplearetocometothemeeting.ItisnoneofyourbusinesswhereIwillspendthissummerholiday.Itremainstobeseenwhetheritwilldotheenvironmentharmorgood.对环境有好处还是有害处,还要等着瞧。It(so)happensthat….Itseems/appearsthat…Ithappenedthatmygrandadwentoutwhenthefirebrokeout.1)当复合宾语中的宾语是不定式、动名词、宾语从句时,用it作形式宾语,将真正的宾语放在宾语补足语之后S+make/think/believe/find/consider/feel+it+adj./n.+todo/doing/that….Heconsidersithisdutytohelpthoseatrisk.Ithinkitnousearguingwithhim.作形式宾语。Theschoolhasmadeitclearoverandoveragainthatsmokingisbannedintheschool.2)like/love/enjoy/prefer/dislike/hate/appreciate+it+that/when/if从句Idon’tlike___whenonespeakswithhismouthfull.要是准许我加入校足球队，我将不胜感激。(admit)IwouldappreciateitifIwereadmittedtotheschoolfootballteam.itIhate_______youspeakwhenyourmouthisfull.3)dependonitthat…relyonitthat…seetoitthat…(makesurethat…)takeitforgrantedthat…Don’ttakeitforgrantedthatfamousbrandsmeanhighquality.itthat1.Youcan______________(相信）hewillcomehereontime.2.Canyou_______________(保证）thedoorislockedwhenyouleave?3.__________________________(我将不胜感激）ifyoucouldshareyourumbrellawithme.4.Don’t_______________________allthosewhogetgoodgradesintheexaminationwillprovetoobethemostsuccessful.dependonitthatseetoitthatIwouldappreciateittakeitforgrantedthatIt用于强调句型中1)“Itis/was+被强调部分+that+句子的其他部分”。如果强调的是人,可以用who,whom代替that。Tomriskedlosinghislifetosaveadrowningchildlastyear.ItwasTomthatriskedlosinghislifetosaveadrowningchildlastyearwhoItisI___________singinginthegarden.thatamWasitTomthatriskedlosinghislifetosaveadrowningchildlastyear2)Is/wasit+被强调部分+that…Whowasitthatriskedlosinghislifetosaveadrowningchildlastyear.3)疑问词+is/was+it+that…注意：Canyoutellme________________riskedlosinghislifetosaveadrowningchildlastyear?whoitwasthatHishealthdidn’timproveuntilhequittedsmoking.Itwasnotuntilhequittedsmokingthathishealthimproved.Notuntilhequittedsmokingdidhishealthimprove.4)Itwasnotuntil…that…1.我是在街上遇见她的父亲的。(强调在街上)2.你是8点开始工作的吗？（强调时间）3.他为什么不能回答这个问题？4.我把手提包落在了我们先前吃晚饭的餐馆里了ItwasinthestreetthatImetherfather.Wasitateighto’clockthatyoubegantowork?ItwasintherestaurantwherewehadhadsupperthatIleftmyhandbag.Whywasitthathecouldn’tanswerthequestion？It用于固定的句型或短语中Itistimethatyou______ajudgementaboutit.1)Itis(high/about)timethat+主语+did/should+do…Itisthefirsttimethathe_____________suchanimportantmatter.2)Itisthefirst/second…timethat+主语+hasdone…madehasdecidedonItistwoyears_______hegotintothehabitofsmoking.3)Itis/hasbeen+一段时间+since+主语+didItwillnotbelong________thenewmeasuretakeseffect.Itwastwoweeks_________heranoutofmoney.4)Itwillbe/was+一段时间+before+主语+does/didsincebeforebeforeItwasnearly12o’clock_______hecamebacklastnight.5)Itwas+时间点+when注意:Itwasat12o’clock_______hecamebacklastnightwhenthatmakeit及时赶到;成功;办成e.g.Youcanmakeittothecinemaifyouhurry.如果你赶快还可以及时赶到电影院。Youneedn’tworry;hewillmakeit.你不必担心,他会办到的。CouldwemakeitnextMonday?(约定时间）视情况而定It/that(all)depends.不紧张；放轻松点Takeit/thingseasy.我无能为力；控制不了自己Ican’thelpit.这就对了That’sit.由某人决定，负责It’suptosb.Justasourteacheroftenputsit,diligencemakesupforintelligence.Howisitwithyourstudy?学习好吗？Wemustfightitout/stickitout/sticktoit.我们必须坚持到底。---Lookoutforth