1 . go to bed 上床睡觉。如：
He goes to bed at nine. 他九点上床睡觉。
He didn’t go to bed until his wife came back. 直到他妻子回来他才睡觉。
比较 go to bed与 go to the bed。如：
He went to bed at 10 last night . 他昨晚10点钟上床睡觉。
He went to the bed and found a letter on it. 他走到床边，发现上面放着一封信。
2 . in bed 在床上。如：
He is still in bed. 他还在睡觉。
He’s sick in bed with a cold. 他因感冒而卧床。
注：该结构中通常不用冠词或其他限定词。
3 . make the bed 铺床。如：
Make the bed whenever you are up. 起床就要铺床。
注：make one’s bed, 意为“自食其果”。如：
As you make your own bed, so you must lie on it. 你是自作自受。
4 . on a bed 在床上。如：
There is a red box on the bed. 床上有个红色的盒子。
注：该结构通常应有冠词或其他限定词，有时它与 in bed 大致同义，只是搭配不同而已。如：
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.
5 . put sb to bed 安顿某人上床睡觉。如：
I’ll just put the children to bed. 我就安顿孩子们去睡觉。
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