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It的用法总结在英语中,it有许多不同的用法,它既可以用作代词(如人称代词、非人称代词)，也可以用作引导词（作形式主语或形式宾语），还可以用来构成强调句型。1.it用作代词(1)用作人称代词在句子中作主语或宾语；指前面已经提到过的事物、动物或人，且it指特定的事物；如果指前文中提到的事物中的任何一个，用one。one可以与any,each,every,not等连用，但one不可代替不可数名词。—Where’syourcar?—It’sinthegarage.你的汽车在哪儿呢？在车库里。(指代物品yourcar)Didyouhitit?你打中了吗？(指代事件)Thebabycriedwhenitwashungry.这婴儿饿时就哭。（指代婴儿，尤指性别不详或无所谓时）—Whoisthat?—It’sme.是谁？我。(指一定情景中所确定的人或事物，此时相当于指示代词，代指this和that,有时也指人)—What’sthis?—It’sabox.这是什么？一只箱子。(2)作非人称代词表示天气、日期、时间、温度、距离、价值、路程、度量、自然现象与环境等。也可模糊地指一般情形或上文的部分或整个意思。译成汉语时，it通常不一定译出来。It’salongtimesincetheyleft.他们走后很久了。It’stwomilestothebeach.离海滨有两英里远。That’sjustit—Ican’tworkwhenyou’remakingsomuchnoise.原因就在这里——你弄出这么大的声音，我工作不了。另外，需要注意两点：（1）“It’stime…”后面可以接不定式和介词短语表示“是做……的时候了”。如：It’stimeforsupper.It’stimetohavesupper.(2)“It’stime…”后面还可以接一个从句，但是从句中的谓语动词一定要用过去式即虚拟语气，如：It’stimewehadlunch.是我们吃饭的时候了。It’stimewestarted.是我们该出发的时候了。2.it用作引导词(1)作形式主语由动词不定式、动词-ing短语或名词性从句担任主语的句子，常用it来作形式主语，而把真正的主语放在句子的后面。It’snoteasyforustolearnEnglishwell.[句型为:It+be+形容词+（forsb.）todosth.]It’sfoolishofyoutosaythattoher.[句型为:It+be+形容词+（ofsb.）+todosth.]It’snouse/good/help…sleepingtoomuch.(句型为:It+be+名词+doing)It’simportantthatwebethereontime.（句型为:It+be+形容词+that从句）It’shightimethatTomwenttoschool.(句型为:It+be+time+that从句，从句中的动词用过去时)Itwasthesecondtimethathehadtelephonedmethatday.[句型为:It+be+thefirst(second,third)time+that从句]（that从句中动词用完成时）Itwasarrangedthattheyshouldleavethefollowingwinter.(句型为:It+be+过去分词+that从句)Itappearsthatthetwoleadersareholdingsecrettalks.(句型为:It+不及物动词+that从句)(2)作形式宾语当宾语是动词不定式、动词-ing短语或名词性从句时，而宾语后又有宾语补足语，则需用it作形式宾语，将真正的宾语放到宾语补足语的后面。用于这种结构的动词有：feel,find,think,make,consider,take等。MarxfounditimportanttostudythesituationinRussia.马克思发现研究俄国的形势很重要。Ifinditstrangethatshedoesn’twanttotravel.她竟不想旅游,我觉得很奇怪。I’llmakeitcleartoyouthatfailureisthemotherofsuccess.我要告诉你们失败是成功之母。3.it用在强调句型中英语中，为了突出句子中的某一成分，达到强调或使人特别注意该成分的目的，人们常用“Itis/was+强调对象+who/whom/that….”句式把整个句子分割成前后两个部分，使之各自有自己的谓语动词，中间由that或who/whom连起来成为一个新句子。除强调人时用who,whom外，其余情况都用连词that。被强调的对象仅限于句子的主语、宾语、宾语补足语和部分状语（包括状语从句），即除谓语和定语以外的句子成分。这部分状语主要包括地点状语、由before,when,after,notuntil等引起的时间状语从句、由because,becauseof引起的原因状语、由by引起的方式状语等。当被强调的对象是人时，可用who,whom或that，其余情况一律用that;当被强调对象在从句中做主语时用who/that,当被强调对象在从句中做宾语时用whom/that。原句：Myfatherdidtheexperimentinthelabyesterdayevening.昨天晚上我父亲在实验室做实验。Itwasmyfatherdidtheexperimentinthelabyesterdayevening.昨天晚上是我父亲在实验室做实验。（强调主语）Itwastheexperimentthatmyfatherdidinthelabyesterdayevening.昨天晚上我父亲在实验室里做的是实验。（强调宾语）Itwasyesterdayeveningthatmyfatherdidtheexperimentinthelab.我父亲是昨天晚上在实验室做实验的。（强调时间状语）Itwasinthelabthatmyfatherdidtheexperimentyesterdayevening.我父亲昨天晚上是在实验室里做这个实验的。（强调地点状语）另外，再注意两点：（1）强调句如果还原成陈述句的话，句子成分是完整的，如果不完整，那必然是别的从句而不是强调句。Itwasthetownwherewelivedforthreeyears.此句是定语从句，因为还原以后的句子为:Welivedthetownforthreeyears.缺少介词（inthetown）,而Itwasinthetownthatwelivedforthreeyears.这就是一个强调句了。（2）强调中心也可以是疑问词，这时要将疑问词置于句首，构成一个特殊疑问句。Whyisitthatyouwanttoleavesosoon?你到底为何这么早就要走？It用法练习题（1）1Itwasatthegate_____hetoldmethenews.AthatBwhatCwhichDwhen2Is____necessarytotellhisfathereverything?AitBthatCwhatDhe3Wasitinthispalace_____thelastemperordied?AthatBinwhichCinwhereDwhich4Is____possibletoflytothemooninaspaceship?AnowBmanCthatDit5WasitduringtheSecondWorldWar____hedied?AthatBwhileCinwhichDthen6Is____necessarytocompletethedesignbeforeNationalDay?AthisBthatCitDhe7Idon’tthink____possibletomasteraforeignlanguagewithoutmuchmemorywork.AthisBthatCitsDit8Does____matterifhecan’tfinishthejobontime?AthisBthatCheDit9Itwasnot___shetookoffherdarkglasses____Irealizedshewasafamousfilmstar.Awhen,thatBuntil,thatCuntil,whenDwhen,then10Tom’smotherkepttellinghimthatheshouldworkharder,but___didn’thelp.AheBwhichCsheDit11____isafactthatEnglishisbeingacceptedasaninternationallanguage.AThereBThisCThatDIt答案：1-5AAADA6-10CDDBD11DIt用法练习题（2）一、填空题1.Ilikeintheautumnwhentheweatherisclearandbright.A.thisB.thatC.itD.one2.Hewasnearlydrownedonce.Whenwas?wasin1998whenhewasinmiddleschool.A.that;ItB.this;ThisC.this;ItD.that;This3.TheParkersboughtanewhousebutwillneedalotofworkbeforetheycanmovein.A.theyB.itC.oneD.which4.Someoneisringingthedoorbell.Goandsee.A.whoisheB.whoheisC.whoisitD.whoitis5.Infactisahardjobforthepolicetokeeporderinanimportantfootballmatch.A.thisB.thatC.thereD.It6.Mike’smotherkepttellinghimthatheshouldworkhard,butdidn’thelp.A.heB.itC.sheD.which7.Sinceyouhaverepairedmycomputer,isnoneedformetobuyanewone.A.itB.thereC.thisD.that8.Theofficialmadeclearthathewoulddoeverythingpossibletosolvetheproblem.A.itB.thisC.thatD.him9.Doyoulikehere?Oh,yes,theair,theweatherandthewayoflife.Everythingissonice.A.thisB.thereC.thatD.it10.Bill’saimistoinformtheviewersthatcigaretteadvertisinginTVisillegal,?A.isn’titB.isitC.isn’theD.ishe.11.ismentionedabove,thenumberofthestudentsinseniorhighschoolisincreasing.A.whichB.AsC.ThatD.It12.Itwaswithgreatjoyhereceivedthenewsthathislostdaughterhadbeenfound.A.becauseB.whichC.sinceD.that13.Itwasbackhomeaftertheexperiment.A.notuntilmidnightdidhegoB.untilmidnightthathedidn’tgoC.notuntilmidnightthathewentD.untilmidnightwhenhedidn’tgo14.Why!Ihavenothingtoconfess.Youwantmetosay?A.What