It is not long before they are so accustomed to swimming 這里的it is為什么在前面,是什么用法
It is not long before they are so accustomed to swimming 這里的it is為什么在前面,是什么用法
英語人氣：380 ℃時(shí)間：2019-11-21 04:47:40
優(yōu)質(zhì)解答
it是形式主語,真正的主語是后面的從句they are so accustomed to swimming,其實(shí)本來的句子是They are so accustomed to swimming is not long before.因?yàn)檫@個(gè)主語太長了,為了避免頭重腳輕現(xiàn)象,就把真正的主語放在后...it是不是代指的they are so accustomed to swimming對的，就是指代這個(gè)從句。
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