Question

① How long does it take to get to school？ ②It takes me ten minutes. -

③How far is it from your home to school？
④It is 5 kilometer.
It 表示什么 陈述句It是形式主语真正主语是什么 为什么不用真正的主语

Answer 1

① How long does it take to get to school？
②It takes me ten minutes.
这两个句子中it是形式主语，代替动词不定式to get to school,动词不定式作主语一般用it代替，避免主语太长，而谓语太短，出现头重脚轻的现象。

③How far is it from your home to school？

④It is 5 kilometer.

这两个句子中的it指距离，it可以指距离，时间等作主语

例如：what time is it?
what day is it today?

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Answer 2

是形式主语，真正的主语太长了，外国人不喜欢头重脚轻。