all that he could 与what he could的区别

all that he could 与what he could的区别
all that he could 与what he could的区别

all that he could 与what he could的区别
all that he could 中的that引导【定语从句】
what he could中的what引导【名词性从句】

all that he could 这里的 all 是先行词 that 是关系代词 定语从句是 he could
eg: All that he could do is just waiting.
what he could 是what引导的名词性从句 可以把它看个一个名词
eg: He did what he could do to make her happy...

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all that he could 这里的 all 是先行词 that 是关系代词 定语从句是 he could
eg: All that he could do is just waiting.
what he could 是what引导的名词性从句 可以把它看个一个名词
eg: He did what he could do to make her happy.

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