how far is it from your school to your home 里from your school to your home 做什么成分?理由?

问题描述:

how far is it from your school to your home 里from your school to your home 做什么成分?理由?

from的介词短语做主语,it形式主语
改成回答句型就好理解了
it is ````` from my school to home

主语,代替it , it是形式主语

from your school to your home 做实际主语it做形式主语,由于真正的主语from your school to your home太长,放在句子开头会显得头重脚轻,故用it做形式主语代替from your school to your home,而把真正的主语放在句子...