是名词词性，表示床的意思，例如：

1、He's in bed with a temperature of 40 ˚.他卧病在床，高烧40摄氏度。

2、She woke up and found herself in a hospital bed.她醒来发觉自己躺在医院的床上。

3、I think it's time to go to bed.我想该睡觉了。

4、She would be in bed by now， as like as not.这工夫她很可能睡了。