it的用法及句型總結

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 用法歸納1， 指代 it （ 1） .用作人稱代詞：指代物、整個句子 （2）用作非人稱代詞2， 形式 it

2、 ：（1）作形式主語 （ 2）作形式賓語3， 強調 it4， 特殊句型5. 在答語中指代 this/that：1）.- Whose book is that?-It ' s mine.三、特別注意：it, one和that作替代詞的用法及區(qū)別1. it 代替前面提到的同一事物 ,該事物既可以是可數(shù)名詞也可以是不可數(shù)名 詞。 (特指，指代單數(shù)，指代物，同名同物 )Can I borrow your pen? Sorry， I'm using it.2. one代替前面提到的同類事物中的一個。該事物只能是可數(shù)名詞，前面可以有冠 詞,也可以被 this、 that 或形容詞修飾 ,其

3、后也可以有定語。 (泛指，指代可數(shù)名 詞，指代人或物，同名異物)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 代替前面提到的同類事物中特指的一個。該事物既可以是可數(shù)名詞也可 以是不可數(shù)名詞 ,必須要有后置定語 ,但不可以有前置修飾語。 (特指，指代單數(shù) 或不可數(shù)，指代物，

4、后面有定語)The coffee produced in Brazil is more famous than in Mexico.代詞特指/泛指人/物名詞特例it特指物單數(shù) 可數(shù)名詞同名同物；指代整個句子that特指物單數(shù)可數(shù)名詞/ 不可數(shù)名 詞后面有定語；指代上文one泛指人、物單數(shù) 可數(shù)名詞同名異物四：形式主語、賓語、強調句及其他1形式主語ItIt is important to give the money back to him on time.不定式It is no use arguing with such a person.動名詞It is said that he was t

5、he No.1 in the competition.主語從句it作句子的形式主語，后面被指代的主語包括：不定式動名詞主語從句It替代作主語的動名詞It nogood/usedoing It's (well)worth doing 例 It's no use crying over spilt milk.形式主語中的虛擬語氣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后的從句要用虛擬語氣(should +動詞原形)，should可以??；常譯為 “據(jù)建議；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 后的從句一般用虛擬語氣( should + 動詞原形)，常譯為“竟然”。沒有 這種意義時，則不用虛擬語氣。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 (有教養(yǎng)的), polite, kind , brave , careless honest ， modest ， considerate, naughty ， wise ， clever ， thoughtful, careful, crazy， bad ， lazy ， rude ， cruel ， foolish ， silly ， stupid ， . 等。這個句型可以改

9、寫為： sb. is adj to do sth. 。It is kind of you to say so.= You are kind to say so.2、形式賓語 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 作形式賓語時，句子的真正賓語是 ：不定式動名詞 賓語從句固定句型 ：1、owe it to sb. that把歸功于2、

10、see to it that務必./負責3、I like (enjoy, hate, dislike)it when.:我喜歡/討厭4、 I would appreciate it if：如果我將不勝感激5、keep it in mind that 把記在心里6、I like (enjoy, hate )it when 7、I would appreciate it if 3、強調句 itIt is/was+被強調部分 + that(who) 用來強調謂語動詞以外的任何句子成分。當 被強調部分是人時也可以用 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 引導的從句通常是一般過去時態(tài)，而且是瞬間動詞。 “做某事已經多久 了”例如： It is ( has been ) 5 years since his father died.It issince + 延續(xù)性動詞的過去式 不做某事已經多久了 ”例。 It 1s0 years since he had breakfastIt is . when .。when 引導時間狀語從句，主句中的 it 指時間，表語由具體的時間充當，常 譯為當?shù)臅r候，是例如： It was 5 o 'clock when he came here.It be . before .whe