关于名词性从句和状语从句的问题

关于名词性从句和状语从句的问题
Whatever David says sounds right to Helen.That's why she has made up her mind to live with him whatever happens.
这句话中,第一个Whatever是在名词性从句,第二个在状语从句.谁能解释下,我觉得这两个好像没什么区别啊,这两个从句又是怎么回事?

解析如下:
此问题涉及到Whatever的双重用法:
1.用于引导名词性从句
Whatever 相当于 Everything or anything that
无论什么
2.用于引导让步状语从句
Whatever = No matter what
不管什么(这里要注意No matter what 只能引导状语从句)
这也是No matter what 与 Whatever 之间的本质区别
上句可以变化为:
Whatever David says sounds right to Helen.That's why she has made up her mind to live with him no matter what happens.
P.S.If you still feel confused ,please leave a message !