it的用法及句型总结

1、It 的用法一、Tell the functions for“it ” in each sentence:1、-What s the weather together?-It is fine.2. It is hard to communicate with him.3. I find it hard to communicate with him.4. It is Li that who cleaned the classroom.5. It is a book.二、 It用法归纳1， 指代 it （ 1） .用作人称代词：指代物、整个句子（ 2）用作非人称代词2， 形式 it ：（ 1）作

2、形式主语（ 2）作形式宾语3， 强调 it4， 特殊句型5.在答语中指代this/that：1).-Whose book is that?-It s mine.三、特别注意：it, one 和 that 作替代词的用法及区别1. it 代替前面提到的同一事物 ,该事物既可以是可数名词也可以是不可数名词。 (特指，指代单数，指代物，同名同物 )Can I borrow your pen? Sorry， Im using it.2. one 代替前面提到的同类事物中的一个。 该事物只能是可数名词 ,前面可以有冠词 ,也可以被 this、that 或形容词修饰 ,其后也可以有定语。 （泛指，指代可数

3、名词，指代人或物，同名异物）I have a bike. Do you have one?Eg:(1).I bought a dictionary three years ago and I am still using_ now.(2) I bought a dictionary three years ago but I am going to buy a new _soon.(3). that 代替前面提到的同类事物中特指的一个。该事物既可以是可数名词也可以是不可数名词 ,必须要有后置定语 ,但不可以有前置修饰语。 （特指，指代单数或不可数，指代物，后面有定语）The coffee pr

4、oduced in Brazil is more famous than _in Mexico.精选文库代词特指 /泛指人 /物名词特例it特指物单数同名同物；指代整个句子可数名词that特指物单数后面有定语；指代上文可数名词 /不可数名词one泛指人、物单数同名异物可数名词四：形式主语、宾语、强调句及其他1、形式主语ItIt is important to give the money back to him on time. 不定式 It is no use arguing with such a person.动名词It is said that he was the No.1 in t

5、he competition. 主语从句it 作句子的形式主语 , 后面被指代的主语包括：不定式动名词主语从句It 替代作主语的动名词It snogood/usedoingIt's (well)worth doing例 It's no use crying over spilt milk.形式主语中的虚拟语气1.It is important ( necessary，strange， natural.) that .It is important that we (should) have enough rice.2. It's surprising that (sho

6、uld) 竟然 例 It's surpring that you should apologize to her without any reason.3. It is suggested ( ordered /demanded/insisted/commanded. ) that .that 后的从句要用虚拟语气（ should + 动词原形），should 可以省；常译为“据建议；有命令）4. It is suggested that the meeting ( should ) be put off.-2精选文库5. It is a pity ( a shame . ) that

7、 .that 后的从句一般用虚拟语气（ should + 动词原形），常译为“竟然”。没有这种意义时，则不用虚拟语气。例如； It is a pity that such a thing ( should ) happen in your class. 6、It is adj ( for sb. ) to do sth.important， necessary， natural ， impossible ， unusual ， rare ， normal ，easy，hard，difficult，dangerous，pleasant ，likely, right, wrong, , clear

8、,obvious, certain, suitable, proper, useful, 等、7. It isadj( of sb. ) to do sth.good （好心的）， nice（有教养的）， polite， kind ， brave ， careless， honest ， modest ， considerate, naughty ， wise ， clever ， thoughtful, careful, crazy， bad ， lazy ， rude ， cruel ， foolish ， silly ， stupid ，. 等。这个句型可以改写为： sb. is adj

9、to do sth. 。It is kind of you to say so.= You are kind to say so.2、形式宾语 itI think it important to give the money back to him on time.I find it no use arguing with such a person.I knew it when he left without saying a word.it 作形式宾语时，句子的真正宾语是：不定式动名词宾语从句固定句型 ：1、owe it to sb. that 把 归功于 2、see to it that

10、:务必 ./负责 .3、I like (enjoy, hate， dislike) it when.: 我喜欢 /讨厌 .4、I would appreciate it if ： 如果 .我将不胜感激5、keep it in mind that把 记在心里6、I like (enjoy, hate) it when .7、I would appreciate it if3、强调句 itIt is/was+被强调部分 + that(who)用来强调谓语动词以外的任何句子成分。当被强调部分是人时也可以用who。4、其他含有 it 的句式It is time ( about time ， high

11、time ) that .例如： It is the first ( second . ) time that .-3精选文库It is the first time I have been here.= This is the first time I have been hereIt is . since .。since 引导的从句通常是一般过去时态，而且是瞬间动词。 “做某事已经多久了 ”例如： It is ( has been ) 5 years since his father died.It issince +延续性动词的过去式 “不做某事已经多久了 ”例。 It s10 years since he had breakfastIt is . when .。when 引导时间状语从句，主句中的 it 指时间，表语由具体的时间充当，常译为当的时候，是例如： It was 5 oclock when he came here.It be . before .whe