It-的用法总结.doc

It 的用法总结一. 代词: 1) 指代上文 2) 指代this/that 3) 指代未知性别的婴儿或孩子或身份不明的人 4）指代时间/地点/天气/温度/距离/环境What does “it” refer to?1.It gets dark very early in the winter.2.What will you call it if its a boy?3.I love spring-Its a wonderful time of the year.4.Its less than 100 kilometres from here to Jinan.5.When the factory closes, it will mean 500 people losing their jobs. 6.Whats this? Its a cat.7.It has snowed much this year. 注意：it,one和that, those作替代词的区别 (1)The book in your bag is very interesting. Can I borrow ?(2) The book in your bag is more interesting than _ on the desk.(3) The weather here is much colder than_ in Nanjing. (4) The books are free. You can take_ free of charge.(5) The books in the bag are better than _ on the desk.it 表示特指，与前面指代的名词是同一个one 表示泛指，指代单数可数名词，与指代的名词同类但不同一个that表示特指，相当于the+名词单数，与指代的名词同类但不同一个those表示特指,相当于the+复数可数名词, 与指代的名词同类但不同一个it指时间的几个重要句式【句式1】it is /has been + 段时间 + since -自从-多久了 It is / has been 3 years since I visited your company.【句式2】It was + 段时间 + before -过了多久-才- It was 3 hours before he realized the truth.【句式3】It will be +段时间 + before -要过多久-才- It will be 3 months before they complete the bridge.【句式4】it was + 点时间 + when -某事发生于-某一时刻It was 10 oclock when the big fire broke out .【句式5】It /this is/was the +序数词+ time + 现在完成时态/过去完成时-（表示某人第几次做某事） It is the second time I have heard of this .【句式6】It is time (about time /high time ) that sb. did /should do （该是干的时候了）It is time that we went to school.对比训练 1. It will be years _ we meet again.2. It is ten years _ I came to this town.3. It is ten years ago _ I came to this town.4. It is the third time _ I _ (visit) to this town.5. It was 2 am. _Tangshan earthquake took place. A. whenB. thatC. beforeD. since二. 引导词: 1)形式主语 2)形式宾语 3)强调句It 作形式主语基本结构： It + be/v. + (for sb/ of sb.) to do sth (动词不定式) doing sth.（动名词短语） that/ whether （从句）注意1：: For or Of ?1. It is important _ us to learn English well.2. It is very kind _ you to help me learn English.3. It is foolish _ you to believe him.4. It is necessary _ you to go over this lesson.注意2; It 何时代替doing?It +be + no useno good + doing stha waste of time 翻译：1. 和他争论没有用。_2. 打电脑游戏是浪费时间。_注意3：that后的从句要用虚拟语气（should + 动词原形），should 可以省 (1). It is a pity (a shame /an honor /a good thing/a fact /a surprise/. ) that . (2). It is important ( necessary，strange，natural.) that . (3).It is insisted(ordered/commanded,suggested/advised/proposed,demanded/requested/required. ) that .注意4：He is said/ reported to have gone abroad.=It is said/reported that he has gone abroad.All the students are believed to have done their best. =It is believed that all the students have done their best.注意5：It + vi.(不及物动词) + that It happens that he was out. 碰巧It seems that he doesnt know the secret. 好像It appears that he is honest. 好像It occurred to me that I lost my purse on the bus. 我突然想到It doesnt matter whether he will come or not. 没有关系It作形式宾语基本结构：动词+ it + 形容词/名词 +（ for/of sb +）to do(动词不定式)think doing sth（动名词短语）believe that 从句（从句）find necessaryfeel possibleconsider natural,suppose no use/no good/make a waste of timekeep I think it important to make a summary in time.I find it a good habit that we make a summary in time.He felt it no use learning English without speaking it. it作形式宾语的特殊句型：V.+ it + if/that/when 动词有喜欢类：enjoy, like, appreciate, prefer讨厌类：hate, dislikeI would appreciate it if you paid in cash.I like it in the autumn when the weather is clear and bright. I hate it when people talk with their mouths full. It引导强调句1. 基本结构：It is/was + 被强调部分 + that /who(人) .例如：他是因为病了才没能帮我 It was because he was ill that he couldnt help me.Was it because he was ill that he couldnt help me?Why was it that he couldnt help me?2. notuntil句式的强调句型： It is/was not until + that . “直到才”例如：He didnt get home until it was dark.，三用在固定结构中的i