作业帮How long did you sleep为什么用did ,不能用were you sleeping 或 asleep.
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How long did you sleep为什么用did ,不能用were you sleeping 或 asleep.
How long did you sleep
为什么用did ,不能用were you sleeping 或 asleep.
How long did you sleep为什么用did ,不能用were you sleeping 或 asleep.
过去的事当然过去时了!
sleep‘ing ’表示进行时；而asleep 表状态（即表示睡着‘的’）.
这样你应该明白了吧?
因为那是过去的，用过去时
How long do you do st 。是表示你做什么多长时间。
How long did you sleep ？是问你睡多长时间、通常问昨天，所以用did
sleep作为一个实意动词 在特殊疑问句中助动词需用do 但是表示过去式时就变换成did
were sleeping是过去进行时 而两人对话时显然 睡 这个动作已经过去了而非进行中
另外 be asleep是一个系表结构表示状态 理由同上
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