It的用法0.ppt

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1、it 的基本用法的基本用法 一一 It 最基本的用法是最基本的用法是人称代词人称代词，主要代表刚提到的东西，主要代表刚提到的东西以避免重复。以避免重复。Eg1:Look at that car.Its going much too fast.Eg2:Where is the car key?-I put it in your drawer.可代表抽象的东西。可代表抽象的东西。Eg:Its all my fault.也可指动物或未知性别的婴儿。也可指动物或未知性别的婴儿。Eg:What a beautiful baby-is it a boy?Eg2:How about the baby?-Il

2、l take care of it.二二 非人称代词非人称代词it It 可表示可表示“是谁（在某处或做某事）是谁（在某处或做某事）”eg:“Whos that?”“Its me.”Eg2:Its your mother on the phone.Eg3:“Why,its you!”she cried.it 有时并不指具体东西，而指天气、时间、环境、距离，有时并不指具体东西，而指天气、时间、环境、距离，价值等，称为非人称代词价值等，称为非人称代词 it.Eg:Its raining.Eg2:Its Tuesday today.Eg3:Its quiet here.Eg4:Its two mil

3、es to the beach.替代词替代词one,ones,that,those,it,That替换表事物的单数可数或不可数名词，替换表事物的单数可数或不可数名词，而而one/ones替换表示人和事物的单数替换表示人和事物的单数/复数可数名词复数可数名词Eg:His younger sister is taller than the elder one.I need the plastic bags,not the paper ones.The coffee produced in Brazil is more famous than that in Mexico.That/those用于替

4、换有定冠词的名词用于替换有定冠词的名词(=the one/ones)；one用于替换有不定冠词的名词。用于替换有不定冠词的名词。The style of the building is similar to that/the one of a temple.A CD player made in Japan costs more than one made in Hong Kong.That/those一一般般不不带带前前置置定定语语，但但必必须须有有后后置置定定语语。One/ones 都都可可。当当被被替替换换词的后置定语用词的后置定语用of短语或被所有格修饰时，用短语或被所有格修饰时，用t

5、hat of/those of替换替换.Eg:I like the vase better than the one/that in another shop.The windows of your flat are cleaner than those of mine.A grandparents job is easier than that of a parent.It和和oneIt指特定的前面提到过的事物，即：指特定的前面提到过的事物，即：it和它替换的是同一事物，和它替换的是同一事物，it前无修饰语；而前无修饰语；而one替换与前提事物有共同之处但并不完全一样的事物，因此，替换与前提

6、事物有共同之处但并不完全一样的事物，因此，one之前或之后之前或之后一定有修饰语来加以区别。一定有修饰语来加以区别。I bought a dictionary three years ago and I am still using it now.I bought a dictionary three years ago but I am going to buy a new one soon.三三 形式主语形式主语it Its better to be early.It was his duty to take care of the orphans.Its no good standing

7、 here in the cold.Its helpless trying to convince her.It doesnt matter waiting a few more days.用于由用于由that 引导的主语从句，有下面几种类型：引导的主语从句，有下面几种类型：1）It+be+形容词形容词/名词名词+that从句：从句：It is natural that they should have different views.Its a shame that youre sick.2）It+动词（动词（+宾语）宾语）+that从句从句 It happened that she was

8、nt in that day.3）It+动词的被动语态动词的被动语态(said/believed/thought/expected/reported/known)+that从句从句 Its said that there has been an earthquake in India.四四 形式宾语形式宾语it:it 可以代表不定式：可以代表不定式：eg:She found it difficult to convince him.Eg2:He felt it his duty to take care of them.It 代表代表that引导的从句：引导的从句：eg:I took it f

9、or granted(that)you would be coming.It间或代表连接代（副）词引导的从句：间或代表连接代（副）词引导的从句：He hasnt made it clear when he is coming back.They havent made it known where the meeting is to take place.五五 用用it起始的其他句型起始的其他句型1）It+be+一时间点一时间点+whenEg:It was Christmas Eve when I got the news of his being killed in a car crash.

10、2）It+be+一段时间一段时间+since It is/has been three week since I last heard from him.3）It is time to do/that(谓语用过去时态）谓语用过去时态）It is time for us to give the house a thorough cleaning.It is time that we gave the house a thorough cleaning4)It+be+the first/second time that(谓语用完成时）谓语用完成时）Eg:It is the first time i

11、n history that two Nobel Prizes have been awarded to the same person.5）It takes sb.Time to doEg:It took Mary 20 minutes to choose a suitable dress for the party.六六 It 用于强调句用于强调句结构：结构：It+is/was+强调部分强调部分+who(whom)/that+其他部分其他部分it可以用来对句子的某一成分加以强调。可以用来对句子的某一成分加以强调。Eg:Nancy saw your sister in Tokyo last

12、week.It was Nancy who/that saw your sister in Tokyo last week.It was your sister whom/that Nancy saw in Tokyo last week.It was in Tokyo that Nancy saw your sister last week.It was last week that Nancy saw your sister in Tokyo.有些否定句也可以改成这种强调结构：有些否定句也可以改成这种强调结构：I didnt hear from her until last summer.

13、It wasnt until last summer that I heard from her.I didnt do all this for myself.It wasnt for myself that I did all this.问句也可变成这种结构：问句也可变成这种结构：Who called him“comrade”?Who was it that called him“comrade”?How did you forget to lock the door?How was it that you forgot to lock the door?Ex:把把下列句子改为强调句：下列句

14、子改为强调句：1.Tom broke the window last night.2.They want money.3.Peter saw his friend in the park yesterday.4.I didnt have an opportunity of seeing her again for several years.5.Why does everyone think Im narrow-minded?6.I didnt receive my letter until yesterday?7.Did Dick call the meeting last week?8.Did it happen in 1980?