This is the reason whyhe late for school为什么用why,why可不可以省
问题描述：
This is the reason whyhe late for school为什么用why,why可不可以省
答
The reason why.这个why引导的应该是定语从句,先行词the reason 在从句中充当原因状语,相当于for which 例如：I don't know the reason why (for which) she looks unhappy today.
所以why 不可以省.