Simone
on the bed 强调与床面接触，-----坐在床上，闷旅液把东西放在床上。与睡觉没有联系。lie on the bed（躺在床上）sit on the bed（坐在床上）the clothes on the bed （放在床上的衣服）in the bed 用在四周或两镇世边有遮挡的床上-----比较少见He sat propped up in the bed by pillows. 他靠着枕头蚂物坐在床上。The matter made him toss in the bed. 那件事使他在床上翻来覆去。in bed 专指卧床或睡觉，例如：Stay in bed extra late or get up especially early. 起床过晚或过早。He's ill in bed. 他卧病在床。
