最标准：I have to go to bed early, because I went to bed too late last night.
在这里go to bed比sleep好是因为sleep是瞬间完成 可以一秒也可以一天
而go to bed单指睡觉这个行为，和sleep有稍许差别
I must go to bed early becasue I slept too late yesterday
Better go to bed early, because yesterday slept too late
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