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the child fell sleep while he was doing his home work(=@__@=

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the child fell sleep while he was doing his home work(=@__@=)哪里错了
请详解
the child fell sleep while he was doing his home work(=@__@=
应该是 fell asleep,而不是fell sleep.
其他地方OK.
再问: 请详细解释一下如何?
再答: fell是fall的过去式,是动词;sleep也是动词。那么fell sleep就是动词+动词,这在英语里是错误语法。而asleep是形容词,可以连接动词的。fall asleep就是睡着了的固定词组。