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、環境等)
２．引導詞
�。粒餍问街髡Z，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．強調結構：It is (was) 被強調部分＋that (或who)…
注意: 在強調結構中，如被強調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，而應用that 。在復習中，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 引起強調句）
3. it，one，that 的區別：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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