前一句对
理由：what his problem is 整体为know的宾语
例句：
I want to know how you feel. Really.
我想知道你的感觉.真的想.
I want to know how you formed this habit.
我想知道你是如何养成这种习惯的.
I want to know how the price system works.
我想知道价格体系是怎样运着的.