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1、It重点用法归纳替代词one,ones,that,those,it,this,that1)one,ones,that,thoseThat替换单数可数名词或不可数名词;one只替换单数的可数名词。Eg:Thevaseontheleftismorebeautifulthan__________ontheright.ThecoffeeproducedinBrazilismorefamousthan__________inMexico.theonethatThat只用于替换表示事物的名词,而one/ones替换
2、表示人和表示事物的名词皆可。Eg:Hisyoungersisteristallerthantheelder___.Ineedtheplasticbags,notthepaper______.oneonesThat/those一般不带前置定语,但必须有后置定语。One/ones都可。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.T
3、hewindowsofyourflatarecleanerthan_________ofmine.Agrandparent’sjobiseasierthan________ofaparent.ThecomputersinourschoolareconnectedtotheInternetwhile__________intheirschoolaren’t.theone/thatthosethatthoseThat/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:Thest
4、yleofthebuildingissimilarto_________ofatemple.ACDplayermadeinJapancostsmorethan________madeinChina.thatone2)it,this和that都可以替代前文已提到的事或情况,细微差别在于it不如其余两者那么强调。Eg:Soshedecidedtopaintthedoorpink.______upsettheneighboursabit.Soshedecidedtopaintthehousepink._____
5、reallyupsettheneighbours.ItThat当前面提到的事物不止一件时,it通常指最先提到的事物,而this/that是指最后提到的事物。Eg:Wekeeptheicecreammachineinthespareroom.________ismainlyusedbythechildren.(指themachine)Wekeeptheicecreammachineinthespareroom.____________ismainlyusedbythechildren.(指thesparer
6、oom)ItThis/ThatThis可以出现在它所指代的事物之前;而that则指上文所提到的事物。Eg:Listento________!Wewillhavethreedaysoff.“Apennysavedisapennyearned.”Whosaid_________?thisthatEg:IboughtadictionarythreeyearsagoandIamstillusing______now.IboughtadictionarythreeyearsagobutIamgoingtobuyan
7、ew_______soon.It用以指特定的前面提到过的事物,即:it和它替换的是同一个事物,it前无修饰语;而one用于替换与前提事物有共同之处但并不完全一样的事物,因此,one之前或之后一定有修饰语来加以区别。3)It和oneitoneIt引起的几个易混淆的时间句型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.It+be
8、+时间+before-clause这个句型中的时间一般为表示一段时间的词语(如:alongtime,months,weeks,days,hours,minutes),主句中的谓语动词用肯定式,意为“过多长时间才......”。主句的谓语动词是否定式时,意为“没过多长时间就......”。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