Nobodyknowsthereasonthatsheisalwayslate关系代词和副词是否对？

Question

Nobodyknowsthereasonthatsheisalwayslate关系代词和副词是否正确 原因是什么

Answer 1

Nobody knows the reason that she is always late.

这里用了关系代词that是不对的。因为reason在后面的定语从句里面做原因状语，所以应该用why。

Answer 2

Nobody knows the reason that she is always late.
没有关系代词或副词。

that是个连词，that引导的不是定语从句，而是同位语从句，说明前面的名词the reason
又如：
She had to face the fact that her life had changed forever. 她得正视她的生活已永远改变了这一事实。
《牛津高阶英汉双解词典》