问题补充：
非限制性定语从句与独立主格结构的区别The factory produced many famous cars every year,none of them shopped to foreign countries.这一句中为什么不能用none of which呢?是不是说非限制性定语从句后面一定要有谓语动词，而独立主格结构后面没有谓语动词呢？这个可以作为判断限制性定语从句与独立主格结构的依据吗
答案：
非限制性定语从句：
The factory produced many famous cars every year,none of (which were )shopped to foreign countries
独立主格结The factory produced many famous cars every year,none of (them )shopped to foreign countries.
看到区别了吧.
