为什么what和how不能引导定语从句?

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为什么what和how不能引导定语从句?为什么what和how不能引导定语从句?为什么what和how不能引导定语从句?how不能,但what完全可以啊.1Whatwasimpossible50yea

为什么what和how不能引导定语从句?
为什么what和how不能引导定语从句?

为什么what和how不能引导定语从句?
how不能,但what完全可以啊.
1 What was impossible 50 years ago may be quite possible today (这是what引导的定语从句)
== Something that was impossible 50 years ago may be quite possible today.(定语从句)
2 How she managed to finish her hard work on time is beyond my ken.(主语从句)
== The way that / in which she finished her hard work is beyond my ken.(定语从句)
3 She told them what she had seen there (定语从句)
== She told them all / everything that she had seen there.(定语从句)
4 They are building a second library in what was once the school cinema..(定语从句)
== They are building a second library in the house that / which was once the school cinema...(定语从句)

比如 I like the man who has got the first prize.定语从句的引导词是为了引导一个形容主语或宾语的句式,who which 可以代替被形容的主语或宾语,what与how不具备这种功能,不适用于这种语境。

它们的意思是什么啊之类的,在汉语里也木有“什么+形容词”这种搭配吧,大概这么记,反正能引导的就那几个,which啊什么的,多背几个句子有语感就差不多了,其实我也说不清= =

简单地说 定语从句中的先行词 在主句中作宾语 在从句中作主语或宾语 what= the thing that. 符合这个 所以what可以 how不行