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 ：（ 1）作

2、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， Im 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 ,其后也可以有定語。 （泛指，指代可數(shù)

3、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 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，后面有定語）The coffee pr

4、oduced in Brazil is more famous than _in Mexico.精選文庫代詞特指 /泛指人 /物名詞特例it特指物單數(shù)同名同物；指代整個句子可數(shù)名詞that特指物單數(shù)后面有定語；指代上文可數(shù)名詞 /不可數(shù)名詞one泛指人、物單數(shù)同名異物可數(shù)名詞四：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 the No.1 in t

5、he 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 snogood/usedoingIt'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 ( 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 后的從句要用虛擬語氣（ should + 動詞原形），should 可以省；常譯為“據(jù)建議；有命令）4. It is suggested that the meeting ( should ) be put off.-2精選文庫5. It is a pity ( a shame . ) that

7、 .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, wrong, , clear

8、,obvious, certain, suitable, proper, useful, 等、7. It isadj( 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。這個句型可以改寫為： sb. is adj

9、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、see to it that

10、: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 if3、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 ， high

11、time ) that .例如： It is the first ( second . ) time that .-3精選文庫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(jīng)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(jīng)多久了 ”例。 It s10 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 oclock when he came here.It be . before .whe