go to bed表示“去睡覺”,強調上床睡覺這個動作,不管是否睡著;go to sleep表示“睡著”,指已入眠的狀態(tài);fall asleep 表示“睡著,睡熟”,強調由醒到睡的瞬間動作,asleep是形容詞,作表語。
He went to bed at 11 last night, but went to sleep at 12. 他昨晚11點鐘上床睡覺,但直到12點才睡著。
He went to sleep in three minutes. 他在3分鐘內就睡著了。
The old man found it hard to fall asleep . 那位老人發(fā)現很難入睡。
比較
I didn't go to bed until 11:30 last night. 我昨晚直到11點半才睡。
I didn't go to sleep until 11:30 last night. 我昨晚直到11點半才睡著。