how 能引导定语从句吗?

问题描述:

how 能引导定语从句吗?
看the way后定语从句的语法点时,资料说有三种,in which ,that ,省略,而且我也没看到有how引导的定从,是没有的吗,跟that不能引导非限定从一样?那how不是关系副词吗?还是说它是副词但不是关系副词?

How 可引导如下从句:
1.主语从句--How he came here is a mystery.
2.宾语从句--I don't know how we can get there so soon.
3.表语从句--It was how we learned so much in so short a period.
4.状语从句--No matter how he begged , the boss didn't care.