请问which引导的非限制性定语从句，怎么又是表语从句呢？谢谢

Question

however difficult situation he encounters,he always keeps a sense of humor,which is what makes him so popular

Answer 1

首先整句翻译：无论他碰到怎样的困难，他总是保持一份乐观的心态，而这一点恰恰让他颇有人缘。

which在句中确实引导了一个非限定性的定语从句，指代前文整句话所表示的情况，what引导的是一个表语从句，在which引导的从句里面充当表语的成分。

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Answer 2

which引导非限制性定语从句，指代前面整个句子，which作主语，至于后面的表语从句就和which无关了，因为在is后面，所以就是作表语。

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Answer 3

whic引导的非限制性定从用来修饰a sense of humour，因为what前面是is，而is后跟表语，所以what引导表语从句，意为让他如此受欢迎的幽默感。

Answer 4

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。本回答被提问者采纳