how far is it from your home to school,的结构

Question

How far is it from your home to school？这个句型里的is it是什么用法？和后面的from部分是什么关系？

Answer 1

一、How far is it：特殊疑问词 how far 加一般疑问句。类似：what is it？
二、it在本句中指代距离，例如：it is 5 kilometres away from here to school.
三、from your home to school 地点状语