why he didn't come 是定语从句.后面的句子对于前面句子是承上的作用.
这两个句子还可以修改成一句话也就是从句的形式：
That's why he didn't come is He hurt his leg yesterday.
还有其实有时候的承上或启下的两个句子,和从句表达的效果是一样的,只不过它们以两句话来表达了而已是吧?___暂时可以这么理解
句子分析：He hurt his leg yesterday.That's why he didn't come.
2个回答
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