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george was exhausted after a day's work 分词作状语

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george was exhausted after a day's work 分词作状语
george was exhausted after a day's work,he took some tablets to help him feel better.把两个句子和成一个句子.
exhausted by a day's work,he took some tablets to help him feel better.为什么把after改成by
形容词作表语,而不是状语.分词结构可做状语,所以用法不一样.“george was exhausted after a day's work”里面的“exhausted”是形容词,而“exhausted by a day's work”里面的“exhausted”是动词的过去分词,所以后面用“by”.
如果用“after”,那么应该这样说:“Being exhausted after a day's work,he took some tablets to help him feel better.”那么在这个句子中,“exhausted”同样是形容词.