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JiangsuAnyiSeniorHighSchool•Revision:•回忆你初中学的it用法用做人称代词，指动物和其它事物。有时也可用来指年龄很小的孩子或婴儿。Eg:Theoldwomanhasacat.Itislovely.“Whereismymathsbook?”“Itisonmydesk.”Thebabyislovely.Itisonlysixmonthsold.It的指代性用法——人称代词：It可用做指示代词，意思是“这”或“那”。Eg:“What’sthis?”“Itisacar.”“What’sthat?”“Itisanoldcar.”“Whoisit?”“Itisme.”It的指代性用法——指示代词：It可用做非人称代词，表示时间、天气、距离、季节等。Eg:“Whattimeisitnow?”“It’sfive.”ItisafinedayinOctober.Itisrainingheavily.Itwasverycoldyesterday.Itisnotveryfarfrommyhometotheschool.It的指代性用法——非人称代词：•总结：•It的指代性用法1人称代词2指示代词3非人称代词——形式主语：Itseemedimpossible(forhim)togetbackhome.Itwasworthwhilesearchingforhisroots.Itwasobviousthathisancestortaughthisyoungergenerationlittleofhisownlanguage.Summarize:不定式、动名词以及主语从句作主语时，为避免“头重脚轻”，要将真正的主语后置。It的非指代性用法小结：It作形式主语，常用在下面的句型中Itis+adj.+forsb.todo….Itis+adj.+ofsb.todo….Ittakessb.timetodosth.Itisnogood/nouse/useless/waste=-8m·····doingsth.Itis+adj+that……Itis+v-ed+that……Itis+n+that……Itseems/appears/happens/turnsoutthat从句(necessary/important/possible/easy…..)(kind/foolish/polite/brave/careless…)(用虚拟：necessary/important/natural/strange/right…)(said/reported/announced/thought…)(apity/ashame/nowonder…)注意：Itis+adj+that...主句中的形容词为important,necessary,right,strange,natural...时that后的从句中要用虚拟语气（should+动词原形），should可以省去Itisimportantthatwe(should)learnEnglishwell.Itisnecessarythathe(should)rememberthesewords.Itisstrangethatheshouldhavesaidthosewords.Practice:1.Itworriedherabit___herhairwasturninggrey.[1992]A.whatB.thatC.itD.for2.___isafactthatEnglishisbeingacceptedasaninternationallangnage.[1994]A.ThereB.ThisC.ThatD.It3.Is____necessarytocompletethedesignbeforeNationalDay?（89标）A.thisB.thatC.itD.heBDC不定式、动名词以及主语从句作宾语时，为避免“头重脚轻”，要将真正的宾语后置。常用于下面的句型中：It的非指代性用法——形式宾语：Airplaneshavemadeiteasyandcomfortableforustotravel.Wefoundituselesslearningatheorywithoutpractice.Itookitforgrantedthatyoushouldstaywithus.Ihateitwhensomeonetalkswithmouthfull.Youmaydependonitthathe’llcomeontime.It做形式宾语，为方便记忆可陈6123结构：为方便记忆可称其为“6123结构”6指主句中常用的动词：think,believe,consider,make,find,feel;1指的是形式宾语it;2指的是宾补的两种形式：形容词或名词3指的是真正宾语的三种形式：不定式短语，动名词短语或that引导的宾语从句。e.g.Wethinkitourdutytocleanourclassroomeveryday.HefeltitimportantlearningEnglishwell.Theyfounditdifficultthattheywouldfinishtheirworkintwodays.It做形式宾语Imetanoldfriendinthestreetlastweek.ItwasIwho\thatmetanoldfriendinthestreetlastweek.Itwasanoldfriendwhom\thatImetinthestreetlastweekItwasinthestreetthatImetanoldfriendlastweek.ItwaslastweekthatImetanoldfriendinthestreet。为了强调句子中的某一成分，可以用下面句型：Itis/was＋被强调部分＋that＋句子其它部分It的非指代性用法——强调句型：•区别：•Itwas5o’clock_____hecamehere.•Itwasat5o’clock_____hecamehere.when/thatthatwhenHedidn’tturnupuntilhewasinvitedasecond.(改为强调句）在强调until引导的状语时，如果在句中有not，not要提前与until连用。格式为：Itwas/isnotuntil+被强调部分+that…Itwasnotuntilhewasinvitedasecondthatheturnedup.Practice:Ididn’tlearnthenewsuntilyesterdayevening.改为强调句ItwasnotuntilyesterdayeveningthatIlearnedthenews.注意：1)强调人可以用who/whom,其余均用that;2)强调句子谓语不能使用此句型，应使用助动词的适当形式。3)在强调until引导的状语时，如果在句中有not，not要提前与until连用。1.Ididmeetanoldfriendinthestreetlastweek.2.Theteacherdidn’tbeginhisclassuntileverybodytooktheirplaces.Itwasnotuntileverybodytooktheirplacesthattheteacherbeganhisclass.1.Itwasnot___shetookoffherdarkglasses___Irealizedshewasafamousfilmstar.[1992]A.when,thatB.until,thatC.until.whenD.when,then2.Itwasabout600yearsago___thefirstclockwithafaceandanhourhandwasmade.[1997]A.thatB.untilC.beforeD.when3.ItwasonlywhenIreadhispoemsrecently___Ibegantoappreciatetheirbeauty.[1998]A.untilB.thatC.thenD.soBAB4).强调句型的一般疑问句结构为：Is/Wasit+被强调部分+that/who/whom+其余部分?Eg:WasitduringtheSecondWorldWarthathedied?--IsitMaryandMikewhowillattendthemeetingtobeheldtomorrow?--Yes,itis.5).若被强调部分为含特殊疑问句的疑问词时，强调句型结构为：疑问词+is/was+it+that/who/whom+其余部分?WhowasitthatImetinthestreetlastweek?WhenwasitthatImetanoldfriendlastweek?Imetanoldfriendinthestreetlastweek.6).强调句型的反意疑问句的简短问句用：isn’tit?/wasn’tit?Yes,itis/was.No,itisn’t/wasn’t.Eg:--Itwasin1969thattheAmericanastronautssucceedinlandingonthemoon,wasn’tit?--Yes,itwas.7).被强调部分若是代词，注意代词的格应与原句的格一致。Eg:Itwashewhohelpedtheoldmanlastyear.Itwashimwhomtheteacherpunishedyesterday.8).被强调部分若是原句的主语，that或who后面的谓语动词在人称和数上应与原句的主语保持一致。Eg:ItisIthatamgoingtoAmerica.ItisMikeandJohnthataredoinganinterestingexperimentinthelab.Practice:1.___the1500's___thefirstEuropeanexploredthecoastofCalifornia.A.Itwasuntil……thenB.Itwasnotuntil……whenC.Itisuntil……thatD.Itwasnotuntil……that2.____computersplaysuchanimportantpartinourdailylife?A．WhyitisthatB．WhyisitthatC．WhywasitthatD．WhyisitBD1形式主语2形式宾语3强调句型It的非指代性用法It的用法总结：1.Itistime(abouttime，hightime)that...该句型中that后的从句应该用虚拟语气，值得注意的是①常用过去时态表示虚拟．②有时也用should+动词原形，should不能省，常译为“是（正是）．．．的时侯．．．”Itistimethatchildrenshouldgotobed.=Itistimethatchildrenwenttobed.C.含it的其它常用句型2.Itisthefirst(second...)timethat...用完成时态.it有时用this替换．常译为“是第一（二）．．．次．．．”。ItisthefirsttimeIhavebeenhere.=ThisisthefirsttimeIhavebeenhere.3.Itis/hasbeen…since...did自从….以来已有…4.Itis...when...该句型中的when引导的是一个时间状语从句，主句中的it指时间，表语由具体的时间充当。常译为“当……的时候，是……”。Itis(hasbeen)5yearssincehisfatherdied.Itwas5o'clockwhenhecamehere.注意:在由since引导的状语从句中,若其谓语动词是持续性动词(或表状态的动词)