请问which引导的非限制性定语从句,怎么又是表语从句呢?

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请问which引导的非限制性定语从句,怎么又是表语从句呢?
however difficult situation he encounters,he always keeps a sense of humor,which is what makes him so popular

However difficult situation he encounters,he always keeps a sense of humor,which is what makes him so popular.
which is what makes him so popular.引导的是非限制性定语从句,what makes him so popular.是表语从句.

请问which引导的非限制性定语从句,怎么又是表语从句呢? which引导的非限制性定语从句 which引导非限制性定语从句位置 as which引导非限制性定语从句的异同 as和which引导非限制性定语从句的区别 as 引导非限制性定语从句的用法是什么?和which有什么区别呢? where 引导的非限制性定语从句定语从句引导非限制性定语从句的引导词有哪几个?分别是什么?(^_^)怎么用 as 和 which 引导非限制性定语从句这句话逗号后面的that是不是用错了啊?非限制性定语从句怎么能用that引导呢?难道根本不是非限制性定语从句? 用which引导的非限制性定语从句中,which必须要做成分吗? 非限制性定语从句which后面引导的句子可以用动词的复数形式吗?