摘要：it的用法 ①用作人称代词,代替前文提到的事情. This bike is not mine. It’s Peter’s. ②用以代替提示代词this, that -What is this? -It’s a pen. -Whose book is that? -It’s Mike’s. ③起指示代词的作用,指一个人或事物 -Who is knocking at the door? -It’s me. -Who is making such a noise. -It must be the children. ④指环境情况等. It was very quiet at the moment. ⑤指时间.季节.天气.气候等 -What time is it? -It is eight o’clock. It often rains in summer. ⑥指距离 It is five kilometers from the office to my home. It is a long way to the factory. ⑦作形式主语和形式宾语 当动词不定式,动名词或从句作主语时,通常把它们放在谓语之后,而用it作句子的形式主语 It is not easy to finish the work in two days. It is not a good habit to stay up late. It is no use crying over split milk. It is a pity that you didn’t read the book.. 当复合宾语中的宾语是不定式,动名词,宾语从句时,往往把宾语放在它的补足语后面,而用it作形式宾语,放在宾语补足语之前 I think it no use arguing with him. I found it very interesting to study English. He made it clear that he was not interested in this subject. 注意:see to it that-和take it for granted that-句型中的it.以及词组make it 中的it. ⑧用于强调结构 要强调句子的某一部分, 可以把it 当作先行词.这种句子的结构是 “It is(was)+被强调部分+that +句子的其余部分 .如果强调的部分是人,可用who whom 代替that I met an old friend in the park yesterday. 此句各部分被强调后句型如下: It was I who /that met an old friend in the park yesterday. It was an old friend who/ that/whom I met in the park yesterday. It was in the park that I met an old friend yesterday. It was yesterday that I met an old friend in the park. (二)数词 数词分两类:基数词和序数词

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