how 的用法之一就是引导名词性从句，相当于that从句。例如：牛津在副词项下有下面例句：

It's funny how (= that) people always remember him. 主语从句 （牛津）

韦氏高阶在连词项下说how=that , 例句如下。

She told us how she had to work hard. 宾语从句 （韦氏高阶）

He knows how you are a valued employee. 宾语从句（韦氏高阶）

It's amazing how they completed the bridge so quickly. 主语从句（韦氏高价）

但如果仔细分析例句，how仍含有方式副词的意味。