摘要:3.用作形式主语.it 没有具体意义.而只是帮助把真正的主语移至句子后尾.使句子显得平稳一些.能借it 给移至句子后尾的主语有三种:一种由不定式表示.一种由动名词表示.一种由从句表示. 1).It 替代真正的主语--动词不定式短语. It is easier to say than to do . It is a good act to help the others. 2).it 替代真正的主语--动名词短语,以动名词短语做主语的句子.主要在以no good, no use, no harm, dangerous, foolish 等词作表语的句中. It’s no harm drinking running water in that area. It’s foolish talking like that. 3).it 替代从句作主语.用从句做主语的带it 的句子很多,常见的有下面几类: ① It is a pity (a shame ,a fact ,a wonder ,a good thing,etc. )that- It is a shame that he didn’t pass the exam. ② It is strange ( surprising,obvious ,true, good,possible,clear,etc. ) that- . It was clear that they had no desire for peace. ③ It seems (happened ,turned out,etc.)that- It seemed that things were not as they expected. ④ It is said ( decided ,expected ,etc)that - It is said that the tickets have been sold out .

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