be asleep/go to bed/go to sleep/get to sleep/fall asleep

　　首先应知道sleep是动词,asleep是形容词。

　　⑴ be asleep指睡着的,睡熟的。例如:

　　He is asleep.

　　他睡着了。

　　⑵ go to bed指上床, 就寝。例如:

　　What time did you go to bed last night?

　　昨天晚上你几点上床睡觉的?

　　⑶go/get to sleep和fall asleep意思接近,都指入睡,睡着, 但是get to sleep常用于否定句中。例如:

　　I went to sleep quite late last night.

　　我昨晚睡着很晚了。