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1、it的用法,一、代词人称代词it可以用来代替一个名词、短语、句子，以免重复。(1)指代刚提到过的同一事物（同类；同一）This is my new car.I bought it yesterday.(2)指动物或不考虑性别的婴儿Where is the cat?Its under the bed.The baby cried when it was hungry.(3)在情景中确认某人或事物（不知性别的人）Who is it?Its me.(敲门)-Whos it over there?-Its the milkman.,(4)指代前句或后句所述的情况/事情He smokes in bed
2、and I dont like it.It would be great if you could join us.(5)指时间、距离、天气或环境等（非人称代词）What time is it?Its seven.Its about 50 kilometers from here to my home.It is snowing.It was very quiet in the garden.,I was disappointed with the film，I had expected _ to be much betterAthat Bthis Cone Dit,2.Toms mother
3、 kept telling him that he should work harder,_ didnt help.A.he B.that C.she D.but it,二、引导词it(1)it用作形式主语:当_,_,_作主语时，常用it做形式主语，Its a pity to refuse.拒绝是令人遗憾的。Its no use saying any more about it.再谈这事没有用。Its not known where she went.她到哪里去了没人知道。,不定式,动名词,从句,一 it用作形式主语,注：Its no use/no good/no pleasure/usele
4、ss/a waste of+doing B.It is said(reported/believed/expected/accepted)that 据（报道，认为）.C.It happens(appears,seems)that;It struck me/occurred to me that突然想到.D.It is a pity(no wonder,)thatE.It doesnt matter that 没关系;It makes no difference that 没影响F:Its important(necessary,easy,kind)_/_sb to do sth.,for,of
5、,他说什么都没关系。_他好像总是对的。_碰巧我当时没有带钱。_据说他已经入党了。_,It doesnt matter what he said,It seems that he is always right,It happened that I didnt have money on me.,It is said that he has joined the party.,_ difficult to be in a foreign country,especially if you dont speak the language.That is always B.It is always
6、C.It would be always D.That will always be,2._ one day they will have enough animals to set them free.It is hoped for B.what is hoped thatC.As is hoped that D.It is hoped that,(2)it用作形式宾语:当_、_、_等用作宾语且其后跟有 _时，使用形式宾语it，而将真正的宾语移至句末。这类的动词有使役动词，find,make，feel,think,consider,see to it that(务必)等。如：I find i
7、t easy to get on with her.I think it best that you should stay here.,不定式,动名词,从句,宾补,it用作形式宾语:,(3)句式 A.喜好：enjoy,like,dislike,love,hate,appreciate it when/if/that.I dont like it when people talk with their mouths full.I appreciate it if you can help me.他讨厌别人用他的自行车。_我不喜欢你生气的样子。_,B.固定句式：我们花费10天去那里。It too
8、k _轮到你来回答问题了。Its_turn_该吃饭了。Its time to,He dislikes/hates it that people use his bike,I dont like it when you are angry.,us 10 days to go there,your,to answer the question,have dinner,1.We must make _ to the public that something should be done to stop pollution.What is clear B.it is clearC.it clear
9、D.that clear2.I hate _ when people talk with their mouths full.A.it B.that C.these D.them,1）Its(about/high)time+that-从句.(虚拟)2）Its first(second)time+that-从句.“某人第 几次做某事”。(从句用完成时)3）Its/has been+时间段+since-从句.“自从 有一段时间了”。4）Its+时间段+before-从句-“过多长时间才”5）It is up to sb to do sth.“该由某人做某事”6)If it were not for
10、/If it hadnt been for“若 不是因为”7)I owe it to you that I am still alive.“归功于”多亏有你我才仍然活着。8)I took it for granted that he would help us.我认为他会帮助我们的。“认为理所当然”9)I depend on it that he will go with us.我还指望着他能和我们一起去呢。,(4)强调句 It is/was that/who 注意以下几点：A.It后用is/was这种单数形式。B.被强调部分是指人时，用_/_，被强调部分指物时，用_。C.被强调部分是指时间或
11、地点时，用that，一般不用_，_之类的。It is I who am right.是我对。,他是死于日本。_他是昨天结婚的。_她是住在什么地方?_是谁教你们英语?_他是什么时候来的？_,that,who,that,when,where,It was in Japan that he died,It was yesterday that he got married,Where is it that she lives?,Who is it that teaches you English?,When was it that he came?,The computers in our scho
12、ol are connected to the Internet while those in their school arent.The football players on our team seem to be more energetic than those on your team.,That/those一般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。,The style of the building is similar to that of a temple.A CD player made in Japan costs more than one
13、made in Hong Kong.,That/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that of/those of.,I like the vase better than the one/that in another shop.The windows of your flat are cleaner than those of mine.A grandparents job is easier than that of a parent.,2)it,this 和 that
14、,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。,So she decided to paint the door pink.It upset the neighbours a bit.So she decided to paint the house pink.That really upset the neighbours,as you can imagine.,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。,We keep the ice cream machine in the spare room.It is m
15、ainly used by the children.(指 the machine)We keep the ice cream machine in the spare room.This/That is mainly used by the children.(指the spare room),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。,Listen to this!We will have three days off.“A penny saved is a penny earned.”Who said that?,3)It和one,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。,I bought a dictionary three years ago and I am still using it now.I bought a dictionary three years ago but I am going to buy a new one soon.,
