关于名词性从句和特殊疑问句的转换问题!

关于名词性从句和特殊疑问句的转换问题!
首先明确一个问题,主语从句是属于名词性从句的一种,eg It has not been decided who win the game .这个是特殊疑问句在名词性从句中作主语,故又称主语从句,但我有一个疑问,根据名词性从句的定义,所有的名词性从句,都可以转换为定语从句,请问当这个特殊疑问句作主语时该怎么转换为定语从句?类似例子还有：which part of the country he will travel to needs discussing ,还有how you know is a problem .