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It的用法用作人称代词1.用于指事。It用作人称代词最基本的用法就是代替前面已提到过的事物，以避免重复。Icannotfindmywatch；Imusthavelostit.2.用于指动物或婴儿。主要用于指动物或性别不详的婴儿。①“Whereisthecat?’’“Itisunderthebed.”②Theygotababyanditwasverylovely.3.用于上文提到的情况。HesmokesalotinbedandIdon’tlikeit.4.用于指人。it用于指人主要用于确定未知人的身份：①“Whoisit？”“It’sme.”②Someonemusthavebeenhere.Butwehavenoideawhoitwas.5.指人时与he和she的区别。当it用于指人时，主要用于确定未知的或身份不明的人，若是指已知的或身份明确的人，则应根据情况使用he或she。比较：⑴Ihearaknockatthedoor.Itmustbethepostmen.⑵Jimisatthedoor.Hewantstoseeyou.6.指物时与One的区别。两者均可代替前面提到的事物，区别是：It指的是与前面已提到的事物为同一物，此时的It等于“the(this,that,my’…)+名词;而one指的是与前面已提到的事物为同一事物，此时的one等于“a+名词”。比较：⑴.IhaveapenbutI’velentittoMary.⑵.Ihaven’tapen;canyoulendmeone?1.用于指时间It’sthreeyearssincehelefthere.2.用于指距离Howfarisitfromheretothestation?3.用于指环境Itwasveryquietinthegarden.4.用于指天气等自然现象⑴.It’sverycoldtoday.⑵.It’s37℃today.用作虚主语或虚宾语5.用于笼统地谈论某情况Icannothelpit.没办法了。“How’sitgoing？”“well，notsogood.”用作形式主语1.基本用法。当不定式、动名词、从句等用作主语时，为避免头重脚轻，通常在句首使用形式主语it，而把真正的主语放在句子末尾：⑴Isitnecessarytodoso？⑵Itdoesn’tmatterwhatshesays.2几种特殊的形式主语⑴.用作动词look、seem、appear、happen、occur、follow等的主语（后接that从句或asif从句）：①Itseemsasifitisgoingtorain.②It（so）happenedthatIhadnomoneywithme.⑵当系表结构接有或引出的状语从句时，通常在系表结构前使用形式主语表示说话人对某情况的看法：①Itwasagoodsurprisetomewhenhesaidthat.②Itwouldbeatragedyifanythingwentwrong.⑶用于其他固定句型,如ifitwerenotfor…,it’stimethat…3误用形式主语的几种情况:⑴在该用it作形式主语的地方而误用其他词Is____necessarytotellhisfathereverything?A.itB.thatC.whatD.he⑵在不该用it作形式主语的地方而误用形式主语____mustbesomethingwrongwiththemachine.A.ThereB.ItC.HeD.That①___isknowntoall,theearthrunsaroundtheearth.②__isknowntoallthattheearthrunsaroundtheearth.A.ItB.whichC.AsD.That③__isdifficulttopersuadehertostay.④__isdifficultistopersuadehertostay.A.ItB.whatC.HeD.ThatAA试比较：CAAB1.基本用法：当不定式.动名词从句等用作宾语且其后跟有宾补时,就应在宾补前使用形式宾语,而将真正的宾语移到句末:①Wefounditdifficulttopersuadeher.②Hemakeitaruletogetupbeforedawn.2.几种特殊的形式宾语：通常意义的形式宾语主要见于真正宾语为不定式.动名词从句等且其后跟有宾语补足语时的情形，即用于“动词＋it＋宾语补足语＋真正宾语”这样的结构，但以下几类形式宾语比教特殊，其后没有宾补：⑴由于介词后通常不能直接跟从句作宾语，有个别特殊结构就在介词后先接it作形式宾语，再跟that从句：①Youmaydependonitthathewillturnupintime.②I’llseetoitthatalltheseletterswillbesenttothepostofficebeforetwelve.用作形式宾语①在其他情况下解决介词后跟that从句的办法是借用thefact作宾语：Theywereworriedoverthefactthatyouweresick.②个别介词（主要是but和except）也可接that从句作宾语：Iknownothingabouthimexceptthathelivesnextdoor.⑵有的动词由于通常只用作及物动词，当它们后接if从句或when从句，通常应先在动词后接it作形式宾语。①Shewon’tlikeitifyouarrivelate.②Hehatesitwhenpeopleusehisbike.能这样用的动词不多，主要有enjoy，like，dislike，love，hate，prefer，appreciate等表示情绪的动词。Ihate_____whenpeopletalkwiththeirmouthsfull.A.itB.thatC.theseD.them请看一高考题：A⑶用于haveitthat（说、认为）,takeitthat（认为）等固定表达中:①Itakeitthatyouagree.②Reporthasitthatabout30peoplewerekilledintheaccident,用于强调句型中It用于强调句型中（略）高考真题精选：1.Is____possibletoflytothemooninaspaceship?A.nowB.manC.thatD.it2.Is___necessarytocompletethedesignbeforeNationalDay?AthisB.thatC.itD.he3.Idon’tthink__possibletomasteraforeignlanguagewithoutmuchmemorywork.AthisB.thatC.itsD.it4.Does__matterifhecan’tfinishthejobontime?AthisB.thatC.heD.itDCDD5.___isafactthatEnglishisbeingacceptedasaninternationallanguage.A.ThereB.ThisC.ThatD.It6.Ihate__whenpeopletalkwiththeirmouthsfull.A.itB.thatC.themD.／7.TheParkersboughtanewhousebut__willneedalotofworkbeforetheycanmovein.A.theyB.itC.oneD.which高考仿真题精选：1.Luckily,___happenedtobeaforeignteacher.A.itB.thereC.theyD.that2.Youshouldmake__aruletoleavethingswhereyoucanfindthemagain.A.itB.thatC.youD.this3.___isknowntoeverybody,themoontravelsaroundtheearthonceeverymonth.A.ItB.AsC.ThatD.WhatDABBAB4.IwantverymuchtobuyacolorTVset,butIcan’tafford___A.itB.oneC.thisD.that5.Ishouldprefer___ifyoudidn’tgotherealone.A.itB.thatC.youD.which6.Heisalwaysreallyrude,___iswhypeopletendtoavoidhim.A.thatB.itC.thisD.which7.Havingatripabroadiscertainlygoodfortheoldcouple,but___remainstobeseenwhethertheywillenjoyit.A.thatB.itC.thisD.which8.Dearme！Justlookatthetime！Ihadnoidea__wassolate.A.itB.asC.thatD.what9.__ishardistodogoodallone’slifeandneverdoanythingbad.A.HeB.ItC.ThatD.WhatBADBAD10.___ishardtodogoodallone’slifeandneverdoanythingbad.A.HeB.ItC.ThatD.What11.__doesn’tseemtohavebeenmuchdifficultyinsolvingtheproblemA.ItB.ThatC.ThereD.He12.Ican’trememberaChristmaswhen__snowedsomuch.A.itB.thatC.whatD.theweatherBCA