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替代词it,one,ones,that,theone,those,theones的用法that替换the+单数可数名词或不可数名词；theone替换the+单数可数名词.Eg:Thevaseontheleftismorebeautifulthan__________ontheright.ThecoffeeproducedinBrazilismorefamousthan__________inMexico.theone/thatthatone替换a/an+名词；ones替换a/an+复数名词。Eg:Hisyoungersisteristallerthantheelder___.Ineedtheplasticbags,notthepaper______.oneonesthose=theones替代the+复数名词，一般有后置定语。当替换词的后置定语用所有格的of短语或当替换词被所有格修饰时，不用one/ones而用thatof/thoseof.Eg:Ilikethevasebetterthan________________inanothershop.Thewindowsofyourflatarecleanerthan_______________ofmine.Agrandparent’sjobiseasierthan________ofaparent.theone/thatthose=theonesthatThat/those用于替换有定冠词的名词；one/ones用于替换有不定冠词的名词。Eg:Thestyleofthebuildingissimilarto_________ofatemple.ACDplayermadeinJapancostsmorethan________madeinChina.thatoneEg:IboughtadictionarythreeyearsagoandIamstillusing______now.IboughtadictionarythreeyearsagobutIamgoingtobuyanew_______soon.it指是前面提到过的同一个事物；而one前面提倒的同类事物，但不是同一个。3)It和oneitoneIt引起的几个易混淆的时间句型1.It+be+时间+since-clause这个句型表示从since从句谓语动作发生以后到现在或过去所经过的一段时间，意为“自从......以来已多久了”Itisthreeyearssincehisfatherpassedaway.2.It+be+时间+before-clause主句的时态可用过去时was或将来时willbe；用was时，before从句的动词用一般过去时用willbe时，before从句常用一般现在时她没过多久就背会了那些诗歌。Itwas_______________shelearnedthosepoemsbyheart.过了很久警察才来。Itwas______________thepolicearrived.要过好几个小时他才会作出决定。It__________hoursbeforehemakesadecision.要不了几个小时我们还会再见面的。__________________beforemeetagain.notlongbeforelongbeforewillbeItwillnotbehours3.It+be+时间+when-clause这个句型中,it指时间，而且表示时间的词语前没有介词(时间一般为具体时间)。主句中的谓语动词和从句中的谓语动词在时态上一般是一致的，主句是willbe，when从句用一般现在时代替将来时。Itwasalready8o‘clockwhenwegothome.Itwasthenextmorningwhenwefinishedourwork.Itwillbemidnightwhentheygetthere.4.It+be+时间+that-clause这个句型是个强调句型。例如：Itwasat5o’clock____hepractisedplayingtheviolininthemorning.(原句是：________________________________)比较：Itwas5o’clock____hestartedinthemorning.Hepractisedplayingtheviolinat5o‘clockinthemorning.thatwhen(5o‘clock前没有介词，这是个定语从句)•I5.it+be+time+that-clause这个句型属虚拟语气结构，不管主句中用的是is或was，that从句都须用动词的过去式或should+动词原型(但不及用过去式普通)，在time之前有时可加上high或about以加强语气。例如：Itistime(that)wehandedinourexercises.(=Itistimethatweshouldhandinourexercises.)Itishightime(that)shewrotealettertoherboyfriend.•I6.It/This/That+thefirst(second,third…)time+that-clause这个句型表示截止到说话时为止的某人的一种经历，关键是注意time前有序数词，主句是is时，从句要用现在完成时；如果主句用一般过去时was，则从句须相应地用过去完成时。例如：Thisisthefirsttime(that)theseEuropeans____________theGreatWallItwasthefifthtime(that)I___________afriendlyvisittoAfrica.hadpaidhavevisited1.Tom‘smotherkepttellinghimthatheshouldworkharder,but___didn’thelp.A.heB.whichC.sheD.it2.Heisaliar,_____Iknewfromhisbehavior.A.whichB.thisC.thatD.such3.___hasalreadybeenpointedout,grammarisnotasetofdeadrules.A.AsB.ItC.ThatD.This4.Itwassevenforty-five___hefinishedthework.A.whenB.thatC.whenD.beforeDAAA5.Wasitbecauseitsnowedlastnight___hedidn‘tcome?A.whyB.thatC.whenD.which6.Does___matterifhecan’tfinishthejobontime?A.thisB.thatC.heD.it7.Europeanfootballisplayedin80countries,making___themostpopularsportintheworld.A.whichB.thisC.thatD.itBDD8.___isnodoubtthathewillsucceedinhisexperiment.A.ItB.ThisC.ThatD.There9.Itworriedabit___herhairwasturninggray.A.whileB.thatC.ifD.for10.Itwasnot___shetookoffherdarkglassesIrealizedshewasafamousfilmstar.A.when;thatB.until;thatC.until;whenD.when;thenBBD