Ok, weve been talking about how throughout history, it was often difficult for people to give up ideas,which had long been taken for granted as scientific truths, even if those ideas were false.
请问这里的how是什么使用方法，是常见的吗？
how作为疑问副词引导名词性从句，有时疑问含义非常弱，接近于that的使用方法。《韦氏高阶》将how 的这种使用方法归为连词：
:that
She told ushowshe had to work hard.
He knowshowyou are a valued employee.
Its amazinghowthey completed the bridge so quickly.
以上三个例句中how用that替换，意义不变。
但《朗文》仍然觉得这种使用方法的how是副词：
5used aftercertainadjectivesorverbstoreferto aneventor situation
It’s amazing how they’ve managed to get everything finished so quickly.
I remember how she always used to have fresh flowers in the house.
以上二句的how也可改为that，意义基本不变。
但毕竟how是疑问副词，尽管有时how的疑问意义非常弱，以致于可以用that替换，句义基本不变，但how从句仍然是wh-从句，而不是that从句。这就意味着how从句可以作介词的宾语，而that从句不可以作介词宾语。
I remember how she always used to have fresh flowers in the house.
He knowshowyou are a valued employee.
以上二句how从句为动词宾语，因此可以改为that从句：
I rememberthat she always used to have fresh flowers in the house.
He knowsthatyou are a valued employee.
大家可以让以上how从句作介词宾语：
We are talking abouthow she always used to have fresh flowers in the house.
We are talking abouthowyou are a valued employee.
此时，how则不可以用that替换，how也不能省略。
网友的句子就是how的这种使用方法，how引导名词性从句作介词宾语。how的疑问含义非常弱，接近于that的使用方法，但因为是介词宾语，故不可以用that引导从句。
