fall asleep强调入睡的动作；be asleep强调睡着的状态。例如：The baby is asleep,don&39;t turn up the radio.My father was so tired that he fall asleep quickly.
asleep的用法
asleep的用法1：asleep的基本含义是“睡着”,泛指已经进入了睡眠的状态。引申可表示“麻木的”“平静的”“静止的”; 也可表示“玩忽职守的”。
asleep的用法2：asleep是表语形容词,偶尔用作定语时须后置,带有修饰语时也可前置。
asleep的用法3：asleep不用于比较等级。
asleep的用法4：asleep可用fast, sound, much或very much等状语修饰,但不可用very修饰。
asleep的用法5：asleep在句中也可用作宾语补足语。
asleep的用法6：asleep表示的是与awake相对的状态,有时含有“本该清醒,但却睡了”的意思。
fall asleep和be asleep的相关例句
After changing the bed, I would fall asleep quickly
换了床单，我很快就能睡着。
He was wont to fall asleep after supper.
他老是吃完晚饭就打盹。
He was asleep there, curled up in the fetal position.
他像胎儿一样蜷曲地睡在那儿。
His eyes were shut and he seemed to have fallen asleep.
他眼睛闭着，似乎睡着了。
