what = the thing/things that,因此what可以用于定语从句,但不需要先行词,换句话说,what其实引导的是名词从句。比如:
This is what I want. = This is the thing that I want.
这就是我想要的。
Do you know what they're doing? = Do you know the thing they're doing?
你知道他们在做什么吗?
What caused the accident were stones. = The things that caused the accident were stones.
一些石头导致了这起事故。
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