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重点代词it的用法和练习（含答案）(1)it用做人称代词的用法it用作代词，意为“它”，既可以指人，也可以指物。it做人称代词，可以用来代替一个名词、短语、从句或句子，以避免他们在句中的重复。这是可以指提到过的，也可以指未提到的，在句中做主语、表语和宾语。1)指事物，it可以知道除人以外的任何事物或动物。Idroppedmywatchanditbroke.我把手表掉在地上摔坏了。2)指人，it主用用于指性别不明的婴儿或只听其声不见其人的人，如：Isitaboyoragirl?是男孩还是女孩？Thereisaknockonthedoor.Itmustbethepostman.“Listen.Someoneiscrying..”“Oh,itmustbeMary.”3）代替某些代词。代词it可以用于代替指示代词this,that以及复合不定代词something,anything,nothing等，如：“What’sthis?”“It’sanewmachine”(2)it用作非人称代词的用法1)it用作非人称代词主要用来指时间、距离、价值、天气、气温及温度等自然现象。如It’stoolatetogotherenow.现在去那已经太迟了。Itrainedalldayyesterday.昨天下了一整天雨。2)用于某些句型。It’stimeforsth.该做某事了。It’stodosth.是时候该做某事了。It’stimeforsbtodosth.某人该干某事了。It’s(about/high)time+that--从句。某人该做某事了。（从句谓语用过去式，有时候用should+动词原形）It’sfirst(second)time+that--从句。某人第几次干某事。（从句谓语动词用现在完成时）It’s+时间段+since从句。自从…以来有一段时间了。It’s+时间段+before从句。过多长时间才…(3)it用作形式主语的用法。1)当不定式、动名词、从句等复杂成分做句子主语时，为保持句子的平衡，通常把真正的主语放在句末，而句首使用形式主语it。如It’sveryimportanttorememberthis.It’shardworkclimbingmountains.It’sunknownwhenhewillcome.2)it用作形式主语的重要句型。①It+be+adj.+for(of)sbtodosth.某人做某事…Itishardforhimtomakeuphismind.他很难下定决心。Itwasfoolishofhertosaysuchathing.她说那样的话，太愚蠢了。提示：此句型中的介词of和for的区别是：of用于指某人的性格，属性，特征等。介词for表示对象，意为“对…来说”。②Ittakes/tooksb+时间段+todosth.某人做某事花了…时间。Ittookmetwohourstofinishmyhomework.③Itisuptosbtodosth.该由某人做某事了。It’suptoyoutomakethechoice.该由你来做选择了。④Itlooks(seems,appears,happens,occurs)that(asif)…似乎…Itseemsasthoughhedidn’trecognizeme.(4)it用作形式宾语的用法。1)当不定式、动名词、从句等复杂成分用作宾语且后面跟有宾语补足语时，通常会在宾语补足语前使用it作形式宾语，而将真正的宾语移至句末。其基本结构为“动词+it+宾语补足语+不定式（动名词或从句）”Ifinditdifficulttodothejobwell.Ithinkitbestthatyoushouldstayhere.Wethinkitnousecomplaining.2)用作形式宾语的几个特殊结构：①动词+it+that-从句Ithinkit(that)hewillcomeontime.②动词+it+when(if)-从句Werallyappreciateitwhensheofferedtohelp.③动词+prep.+it+that-从句Ican’tanswerforitthathewillcome.我不能保证他会来。④动词+it+介词短语+that-从句Itookitforgrantedthathewouldhelpus.(5)it在强调句中的用法。强调句的基本结构是：It+be+被强调部分+that(who)+其他部分。Itwasacomputerthatheboughtlastweek.练习部分1.Ilikeintheautumnwhentheweatherisclearandbright.A.thisB.thatC.itD.one[解析]C.句中like为及物动词,后面需要跟宾语.而like之后不可直接接从句作宾语.it可用于某些动词(hate,appreciate…)和介词之后作笼统宾语.2.Hewasnearlydrownedonce.Whenwas?wasin1998whenhewasinmiddleschool.A.that;ItB.this;ThisC.this;ItD.that;This[解析]A.第一空用that指代上文提到的事情;第二空用it指代第一空的that3.TheParkersboughtanewhousebutwillneedalotofworkbeforetheycanmovein.A.theyB.itC.oneD.which[解析]B此处it指代前面出现的anewhouse.it指代上文提到的同一事物,为特指;而one通常指代同类事物中的某一个.4.Someoneisringingthedoorbell.Goandsee.A.whoisheB.whoheisC.whoisitD.whoitis[解析]D此处it用作人称代词,指不明身份,性别的人;宾语从句应用陈述语序.5.Infactisahardjobforthepolicetokeeporderinanimportantfootballmatch.A.thisB.thatC.thereD.It[解析]D此处it用作形式主语.6.Mike’smotherkepttellinghimthatheshouldworkhard,butdidn’thelp.A.heB.itC.sheD.which[解析]B此处it用以指代前面的句子,可用that替换.7.Sinceyouhaverepairedmycomputer,isnoneedformetobuyanewone.A.itB.thereC.thisD.that[解析]B考查固定句型Thereisnoneedforsbtodosth8.Theofficialmadeclearthathewoulddoeverythingpossibletosolvetheproblem.A.itB.thisC.thatD.him[解析]A此处it用作形式宾语.9.Doyoulikehere?Oh,yes,theair,theweatherandthewayoflife.Everythingissonice.A.thisB.thereC.thatD.it[解析]D此处it泛指自然环境.10.Bill’saimistoinformtheviewersthatcigaretteadvertisinginTVisillegal,?A.isn’titB.isitC.isn’theD.ishe[解析]A主语为“Bill’saim”.11.ismentionedabove,thenumberofthestudentsinseniorhighschoolisincreasing.A.whichB.AsC.ThatD.It[解析]B非限制性定语从句中,as/which均可指代整句话的内容,但which只能放在主句后,译为“这一点”;as则位置灵活,译为“正如”.12.Itwaswithgreatjoyhereceivedthenewsthathislostdaughterhadbeenfound.A.becauseB.whichC.sinceD.that[解析]D考查强调句型.13.Itwasbackhomeaftertheexperiment.A.notuntilmidnightdidhegoB.untilmidnightthathedidn’tgoC.notuntilmidnightthathewentD.untilmidnightwhenhedidn’tgo[解析]C考查notuntil结构强调句型.14.Why!Ihavenothingtoconfess.Youwantmetosay?A.WhatisitthatB.WhatitisthatC.HowisitthatD.Howitisthat[解析]A考查强调句型的特殊疑问句句式.15.Itistheabilitytodothejobmattersnotwhereyoucomefromorwhatyouare.A.oneB.thatC.whatD.it[解析]B考查强调句型.被强调部分是notwhereyoucomefromorwhatyouare(but)theabilitytodothejob.为了平衡结构,部分移至句尾1.（据报道）alotofpeoplelosttheirjobsinthecitylastmonth.(report)2.（据报道）,alotofpeoplelosttheirjobsinthecitylastmonth.(report)3.（毫无疑问）hewillbeadmittedtothekeyuniversity.(doubt)4.Hehasmadesomegreatmovies.（这一点是毫无疑问的）.(doubt)5.（没必要）foryoutogetupearlytomorrow.(need)6.（碰巧）Ihadbeenawaywhenhecalled.(happen)7.（看来）nobodyknowswhathashappened.(seem)8.（看起来似乎）it'sgoingtorain.(look)9.（很可能）thethievesdon’tknowhowmuchitisworth.(likely)10.（我也许可以）toleaveamessageforher.(possible)1.It’sreportedthat2.Asisreported3.Thereisnodoubtthat4.Thereisnodoubtaboutit5.Thereisnoneed6.Ithappenedthat7.Itseemsthat8.Itlooksasif9.It’slikelythat10.It’spossibleforme11.It’snouse（为打翻的牛奶而哭泣）.(cry)12.（抱怨是毫无用处的）,theyneverlisten.(use)13.（难怪）you’veachievedsomuchsuccess.(wonder)14.(很明确）mostofthefarmershavebroughtinmoremoneybyallmeans.(certain)15.（据说）theprofessorhasalreadysucceededincarryingoutthisexperiment.(say)16.Theprofessorissaid已成功）incarryingoutthisexperiment.(succeed)（比较句型15）17.（感到遗憾）Ihaven’tbeentotheget-together.(pity)18（使之成为一种惯例）thatIgetupatsixeverydayinthemorning.(rule)19.I（认为有必要）totakeplentyofhotwatereveryday.(think)20.It’shightimethatw