how引导的定语从句造句（how为啥不能引导定语从句）

We admired him for the way how he faced difficulties.我们钦佩他如何面对困难。

How we can increase our production)remains a problem. （表示很不赞同或吃惊）你怎么能 。

Ugh! How can you eat that stuff?

啊！你怎么吃得下那种东西

We want to know the way how he lean English?我们想知道他学习英文的方法。