It 的用法

　　１．作人稱代詞

　　John likes playing Pingpong．/ He always does it in the afternoon．(指代上下文提到的事物)；/　　It's time we went home. / How far is it from here to your home ? / It is getting warmer and warmer．/ It's very quiet at the moment．(可指時間、天氣、環(huán)境等)

　�。玻�引導詞

　　　�。粒�作形式主語，代替由不定式、動名詞或從句表示的真正主語。

　　　　It's important for us to learn a second language．/ It's no use talking to him．/ It's known to all that the earth goes round the sun．

　　　　B．作形式賓語，代替由不定式、動名詞或從句表示的真正賓語。

　　　　We feel it our duty to help others．/ He made it clear that he would leave the city．

　　　　C．強調(diào)結(jié)構(gòu)：It is (was) 被強調(diào)部分＋that (或who)…

　　　　注意: 在強調(diào)結(jié)構(gòu)中，如被強調(diào)部分為時間狀語或地點狀語，其后的連接詞也絕不能為when 或where，而應(yīng)用that 。在復(fù)習中，一定要注意句式的不同。

　　　　It was in Shanghai that I bought the guitar．(that引起強調(diào)句)

　　　　It was Shanghai where I bought the guitar．(where引起定從)

　　　　It was twelve o'clock when we arrived there．(when引起時間狀語從句）

　　　　It was at twelve o'clock that we arrived there．（that 引起強調(diào)句）

　　3. it，one，that 的區(qū)別：作為代詞，這三個詞的對比使用是高考的熱點之一。

　　　　NMET2000，23．

　　　　---Why don't we take a little break? ---Didn't we just have __________?

　　　　A．it B．that C．one D．this

 

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