Ⅰ. asleep adj “睡著的”;常作表語。如：

　　① The children have been asleep.孩子們已睡著了。

　　② He was too tired and fell asleep at once. 他太累了，立刻就睡著了。

　　Ⅱ. sleep v & n “睡著”。如：

　　① You have a good sleep. 你需要好好睡一覺。

　　② Last night I sleep very well. 我昨天晚上睡得很好。

　　Ⅲ. sleepy adj “困乏的、想睡的”。如：

　　① She is always sleepy. 她總是想睡覺。

　　② I feel very sleepy now. 我現在昏昏欲睡。