1、IT的用法1.-Where is my book?-It is on the table.2.-Whose book is that?-Its hers.3.-Who is making such a noise?-It must be the children.4.It was very quiet(noisy)at the moment.5.-What time is it?-It is 8oclock.6.It often rains in summer.7.It is five kilometers from the office to my home.用做人称代词，代替前文提到过的事
2、物用以代替指示代词this,that.指一个人或事物指环境，情况等指时间指天气指距离8.It 用来代替整个句子所表达的意思Toms mother kept telling him that he should work harder,but _ didnt help.A.he B.which C.she D.itD9.用做形式主语,代替句子后面的真正主语-不定式，动名词，或从句It is a pity that you cant come tomorrow.It is no use crying over spilt milk.It is not a good habit to stay up
3、 late.区分One,ones,the one,the ones,that,those这些替代词：1.要明白使用替代词的目的是要代替前面的名词，以避免重复。2.还要弄清楚代词替代什么样的名词，如：可数还是不可数？是泛指还是特指？One用来替代前面出现的单数名词，是泛指概念，相当于a/an+单数名词。Ones用来替代前面出现的复数名词，也是泛指概念。The one用来替代前面的特指的单数名词，有时可用that替代（尤其在有后置定语的情况下）。The ones用来替代前面特指的复数名词，有时可用those替代（尤其在有后置定语的情况下）。That用来替代前面出现的特指的单数可数名词，或特指的不可
4、数名词，相当于the+单数/不可数名词。Mr.Zhang gave me a very valuable present,_ that I have never seen.Mr.Zhang gave me many valuable presents,_ that I have never seen.The book on the desk is better than _under the desk.The books on the desk are better than _under the desk.onea presentonesmany presentsthat/the oneth
5、ose/the onesI prefer a flat in Beijing to _ in Nanjing,because I want to live near my Moms.Cars do cause us some health problems-in factfar more serious _ than mobile phones do.Im moving to the countryside because the air there is much fresher than _ in the city.oneonesthat10.常用在find,feel,think,cons
6、ider,make等动词之后，做形式宾语，代替后面真正的宾语-不定式，动名词或从句He made it clear that he was not interested in this subject.I found it very interesting to study English.I think it no use arguing with him.11.用于强调句型中：It is/was+被强调的部分+that(who)+句子的其余部分Tom worked in a factory in 1999.It was Tom that/who worked in a factory in
7、 1999.It was in a factory that Tom worked in 1999.It was in 1999 that Tom worked in a factory.当It is/wasthat句型中，将It is/was,和that省略之后，剩下的部分是一个完整的句子时，这个句子就是强调句型。It is English that Prof.Lin teaches us.Prof.Lin teaches us English.It was for that reason _ her uncle moved out of New York and settled down
8、in a small village.A.which B.why C.that D howCIt was for that reason that her uncle moved out of New York and settled down in a small village.For that reason,her uncle moved out of New York and settled down in a small village.1.Was _ that I saw last night at the concert?A.it you B.not youC.you D.that yourself2._ that told you the news?A.Who it was B.Which it wasC.Who was it D.which was itACIt was you that I saw last night at the concert.It was who that told you the news?
