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语法知识精讲一．代词it的用法1.用作人称代词代替前面所提到的事物。如：Mydictionaryismissing.Ican’tfinditanywhere.2.用于代替指示代词this,that.—Whatisthis?—It’sacomputer.—Whosecomputeristhat?—It’shers.3.用于表示季节、时间、距离、自然现象和环境。Itwasratherwindyatseasometimes.ItwasthousandsofmilesfromChinatoAmerica.Itwasmidnightwhenheheardamancryingsoftly.Itwasterrible,longjourneyforhim.二．引导it的用法1．作形式主语，代替由不定式或不式复合结构、动名词、或从句所表示的真正的主语。如：Itisexcitingtofindanancienttomb.(代替不定式)Itwaswrongforyounottohelpher.(代替不定式复合结构)Itisn’tknownwhereshehasgone.（代替主语从句）Itwillbeuselesslearningatheorywithoutpractice.（代替动名词）Itisbelievedthatthismanfoundinthegravewasfromarichfamily.（代替主语从句）2．作形式宾语，带替由不定式、动名词或从句所表示的真正宾语。Weconsideritnecessarytomastertwoforeignlanguages.（代替不定式）Wefoundituselesslearningatheorywithoutpractice.（代替动名词）MayItakeitthatyouwillwritemealetter?（代替宾语从句）Ihateitwhenpeopletalkwiththeirmouthfull.(代替宾语从句)3．用在强调结构中。为了强调句子的某一成分（通常是主语、宾语、或状语），常用“Itis(was)+被强调部分+that(who)…”结构。如：ImetTominthestreetyesterday.这句子可用该结构来分别强调句中的主语、宾语、地点状语和时间状语。如：ItwasIwhometTominthestreetyesterday.ItwasTomthatImetinthestreetyesterday.ItwasinthestreetthatImetTomyesterday.ItwasyesterdaythatImetTominthestreetIt用法专练1.Howis_____possibleforsomeoneofsuchamodestbackgroundtogethisbookpublished?A.whatB.thatC.itD.this2.Inwhichplayis_____yourbrotherappears?A.thatwhereB.thiswhenC.itthatD.itwhere3.______theharderyouworkthebetterresultyouwillget.A.It’sbelievedthatB.WhatwebelievedthatC.It’sfactD.Whatthefactis4.Weconsider________abeautifulcitytovisitinautumn.A.thatB.itC.thisD.what5.—Canyoutellushowthewarwasintheend?—Idon’tknow.________.A.It’shardtosayB.Itdoesn’tmatter.C.It’snosaying.D.It’sdependsonthework.6.Does______matteralotwhethershewillcomeherebybusorbytaxi?A.thethingB.thatC.itD.hermother7.Nothingcanstopus,_______?A.can’titB.canitC.can’tweD.canwe8._______feltfunnybeingcalledgrandmother.A.IB.weC.ItD.Everyone9.—listen!Someoneisunlockingthedoor.—______mustbeyourfathercomingbackfromBeijing.A.ItB.ThereC.ThatD.This10.—Holdtheladderforme.—That’s_______.A.allB.allrightC.completeD.it11.—Haveyouwrittenalettertoher?—No,butI’mgoingtowrite_______tonight.A.itB.thatC.thoseD.one12.—Willtheycometothemeeting?—________.A.IknowsoB.Iamsureso.C.Iamsureofit.D.Iquestionit13.It______MaryandTomthatIsawinthestreet.A.wasB.wereC.areD.willbe14.______nowprettylate,wetookcandlesandwentupstairs.A.BeingB.ForC.ForbeingD.Itbeing15.______seemslittledifferentbetweenthetwowords.A.ItB.ThisC.ThatD.There16.—Whocametoseeyoulast?—______wasanoldfriendofmine.A.ThatB.ThisC.ThereD.It17.Theteachertoldthestudents_______.A.whytolearnEnglishimportantB.whywasitimportanttolearnEnglishC.WhyitimportanttolearnEnglishD.WhyitwasimportanttolearnEnglish18.TherewasalotofrubbishonthefloorsoIaskedJacktosweep______up.A.herB.itC.themD.what19.Iwantthatnewcoatbut______istooexpensiveformeatpresent.A.whichB.oneC.itD.what20.Ourfoodandservicearebetterthan______usedtobe.A.itB.weC.theyD.them21.TheTVsetmadeinChinaaremuchbetterthan_____inJapan.A.thatB.thoseC.themD.it22.—Iamlookingforaflat.—Wouldyoulike_____with_____garden?A.it;theB.it;aC.one;aD.one;the23.Idon’tthink_____possibletomasteraforeignlanguagewithoutmemorywork.A.thisB.thatC.itsD.it24.Itwasnot______shetookoffherglasses_____Irealizedshewasafamousfilmstar.A.when;thatB.until;thatC.until;whenD.When;then25._______fouryearssinceIjoinedtheArmy.A.itwasB.ItisC.ThereisD.TherewasAnswers:1-5CCABA6-10CBCAD11-15DAADD16-20DDBCC21-25BCDBB