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

　　首先應知道sleep是動詞,asleep是形容詞。

　?、?go to bed指上床, 就寢。例如:

　　What time did you go to bed last night?

　　昨天晚上你幾點上床睡覺的?

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

　　I went to sleep quite late last night.

　　我昨晚睡著很晚了。

　?、莃e asleep指睡著的,睡熟的。例如:

　　He is asleep.

　　他睡著了。