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

2、 ：（1）作形式主语 （ 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， I'm 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

3、后也可以有定语。 (泛指，指代可数名 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 usingnow.(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，

4、后面有定语)The coffee produced in Brazil is more famous than in Mexico.代词特指/泛指人/物名词特例it特指物单数 可数名词同名同物；指代整个句子that特指物单数可数名词/ 不可数名 词后面有定语；指代上文one泛指人、物单数 可数名词同名异物四：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 t

5、he No.1 in the 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 nogood/usedoing It'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 ( necessarystrange, natural.) that .It is importa nt that we (should) have eno ugh rice.2. It's surprising

6、 that(should)竟然例 It's surpri ng that you should apologize to her without any reas on.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.5. It is a pity ( a shame . ) tha

7、t .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, wro

8、ng, , clear,obvious, certain, suitable, proper, useful, 等、7. It is adj ( 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

9、写为： sb. is adj 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、

10、see to it that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 if 3、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 ，h

11、igh time ) that . 例如：It is the first ( second . ) time that . 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 1s0 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 o 'clock when he came here.It be . before .whe