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Don't sing.She _____(sleep).是is sleeping还是asleep,求详解

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Don't sing.She _____(sleep).是is sleeping还是asleep,求详解
个人以为此处用 “is sleeping”比用“is asleep”更形象一些.
asleep 指的是已经睡着的状态.一般做表语
sleeping 指的是 一直延续的睡觉的动作,作表语或定语.
fall asleep 强调的是某人入睡的状态.
i am sleepy,so i want to sleep,maybe i will be asleep in ten minutes,but i find it is hard to fall asleep,the dog next to me is sleeping quietly on the floor.
这个句子应该能让你理解一些,