bed是否连用冠词或其他限定词的问题

一、一般说来，表示与“睡觉”这一概念有关时，通常不用冠词或其它限定词，反之则用：

It is too early for bed. 现在睡觉太早了。

He went to bed at 9 last night. 他昨晚9点上床睡觉。

He wentto the bed and found a letter on it. 他走到床边，发现上面放着一封信。

He sat by the bed, watching TV. 他坐在床边看电视。

二、与介词in连用时，通常不用冠词；而与介词on连用时，通常要有冠词：

He is still in bed. 他还在睡觉。

He’s sick in bed witha cold. 他因感冒而卧床。

There is a box on the bed. 床上有个盒子。

有时两者都可以用，只是搭配不同而已：

躺在床上看书是个坏习惯。

正：It is a bad habit to read in bed.

正：It is a bad habit to read on a [the] bed.

三、与介词into, out of 等连用时也通常不用冠词或其它限定词：

He got into bed quickly. 他很快上了床。

He jumped out of bed as soon as he heard the bell. 他一听到铃声就跳下了床。