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1、 I 代词让1.用作代词, 代替前文提到的事物。MYy watch is missing. I cant find it anywhere.Her father has gone abroad. Have you heard abonut it?2.指代人时，一般用于小孩或身份不十分明朗的人。JD 一Whois the baby? 一Its my teacher”s son.2) 一Who is knocking the door?一Its my friend Tom. He (不可用ID wants to see you.3. 表示时间、和天气、距离、季节、明暗等。Its time for
2、lunch.Its getting warmer and warmer.Its forty years since my hometown wasliberated .Its summer now.Hovw far is it from here to the airport?Its about twenty minutes” walk from here tothe bus stop .三章 殉众:1. it 和 one1bought a dictionary three years ago and 1am stilusing 让now.1bought a dictionary three
3、years ago but 1am goingto buy a new one soon.sitL指代同名同物。当one 指代前面提到的类似的事物，不是同物，而且one之前或之后有修饰语。 2.it, this, thatSo she decided to paint the door pink. It upset theneighbours a bit.So she decided to paint the house pink. That reallyupset the neighbours, as you can imagine。都可以替代前文已提到的事或情况，细微差别在于it不如thi
4、s ，that那么强调，We keep the ice cream machine in the spare room.lis mainly 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)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。 由. 作形式主语, 代替由不定式, 动名词或从名表示的真正主语。其基本句型为
5、: 1.itis + no goodno use no harm.+doingltis no use going there again .ltis no good sleeping too late.2.ltis + 形容词 (+for sb.) + to do sthlt is dangerous for you to play with fire.important, necessary, easy , hard, safe ,interesting，difficult, common, normal, natural, dangerous，unusual, possible, impo
6、ssible, pleasant 3.lt is + 形容词 (fofsb.) +todo sthIt was foolish of her to waste money on such clothes.|指人的特性形容词，常见的有 bad, cruel, lazycareless, kind, nice, honest, brave, cleverm,wise, foolish, silly, stupid, naughty, polite，rude. 3.Itis + 名词+ to do sth数夜并不是一个好习惯.Itis not a good habit to stay up late
7、.去野炊是一件很快乐的事情.Itis a pleasure to go to picnic.bad manners, a good habit，a shock，apleasure 4. it 替代从句作主语GO Itis a pity (a shame, afact, a wonder, agood thing) that.lt is a shame that he didnt pass the exam.) Itis strange ( surprising, obvious, true，good, possible, clear, etc. ) that.lt was clear that they had no desire for peace. It seems (happened/ appears/ turned out)that.lt seemed that things were not as theyexpected.ltis said ( decided / expected/ believed/thought/reported -)-thatlt is said that the tickets have been sold ouit .
