it will take you two hours to get thereby train中it指代什么

Question

如题所述

Answer 1

it 形式主语 ，为了避免句子"头重脚轻"
真正主语是动词不定式结构
即
It will take you two hours to get there by train.
= To get there by train you take you two hours.
乘火车到那里要花两个小时。

Answer 2

it 为形式主语，指代不定式 to get there by train. 全句可为
To get there by train will take you two hours.

Answer 3

It will take you two hours to get there by train.其中，it 是形式主语，指代的是to get there by train