最基本的用法是人称代词

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1、It的用法It的用法It最基本的用法是人称代词，主要代表刚提到的东西以避免重复。E.g:Lookatthatcar.It’sgoingmuchtoofast.Eg2:Whereisthecarkey?----Iputitinyourdrawer.也可以代表抽象的东西。E.g:It’sallmyfault.也可以指动物或未知性别的婴儿。E.g:Whatabeautifulbaby---isitaboy?Eg2:Howaboutthebaby?----I’lltakecareofit.还可代表一个彼此都知

2、其何所指的东西。E.g:Wheredoesithurt?E.g2:Ifhedoesn’tcome,Ican’thelpit.Eg3:Youhavesavedmylife.Ishallneverforgetit.非人称代词itIt用于代替指示代词，It可以表示“是谁（在某处或做某事）”e.g:“Who’sthat?”“It’sme.”E.g2:It’syourmotheronthephone.E.g3:“Why,it’syou!”shecried.It还可以用来泛指某件事。E.g:Isn’titawfu

3、l!E.g2:Itdoesn’tmatter.it有时并不指具体东西，而指天气、时间、环境、距离等，称为非人称代词it.E.g:It’sraining.E.g2:It’sTuesdaytoday.E.g3:It’squiethere.Eg4:It’stwomilestothebeach.替代词one,ones,that,those,it,this,thatone,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。E.g:Thevaseontheleftis

4、morebeautifulthantheoneontheright.ThecoffeeproducedinBrazilismorefamousthanthatinMexico.That只用于替换表示事物的名词，而one/ones替换表示人和表示事物的名词皆可。E.g:Hisyoungersisteristallerthantheelderone.Ineedtheplasticbags,notthepaperones.ThecomputersinourschoolareconnectedtotheInt

5、ernetwhilethoseintheirschoolaren’t.Thefootballplayersonourteamseemtobemoreenergeticthanthoseonyourteam.That/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。E.g:Thestyleofthebuildingissimilartothatofatemple.ACDplayermadeinJapancostsmorethanonemadeinHongKong.That/t

6、hose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.E.g:Ilikethevasebetterthantheone/thatinanothershop.Thewindowsofyourflatarecleanerthanthoseofmine.Agrandparent’sjobiseasierthanthatofaparent.2)it,this和that都可以替代前文已

7、提到的事或情况，细微差别在于it不如其余两者那么强调。E.g:Soshedecidedtopaintthedoorpink.Itupsettheneighboursabit.Soshedecidedtopaintthehousepink.Thatreallyupsettheneighbours,asyoucanimagine.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。E.g:Wekeeptheicecreammachineinthespareroom

8、.Itismainlyusedbythechildren.(指themachine)Wekeeptheicecreammachineinthespareroom.This/Thatismainlyusedbythechildren.(指thespareroom)This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。E.g:Listentothis!Wewillhavethreedaysoff.“Apennysavedisapennyear