fall asleep 属“连系动词+表语”结构,“入睡;睡着”,指进入梦乡
往往含有“不知不觉就睡着了“的意思。asleep在此作表语形容词。
He was just falling asleep when there was a loud knock at the door. 他刚要入睡时,这时传来了响亮的敲门声
sleep 指睡觉时的一种状态,是一个延续性的动词。
He likes to sleep for an hour in the afternoon. 他喜欢在下午睡上一个小时
go to sleep 意为“入睡,睡着”,强调从开始睡到睡着的过程。
I just want to close my eyes and go to sleep as quickly as possible. 我只是想闭上眼睛,尽快地睡上一觉
get to sleep 与 go to sleep 意思相近,但它强调的是进入睡眠状态。
She was too excited to get to sleep last night. 她昨晚因太激动而不能入睡
go to bed“就寝”,“上床睡觉”,指上床去睡这个动作,与 get up 相对应。
The students in our school usually get up at six in the morning and go to bed at half past nine in the evening.