By 8 o'clock ,at 8o'clock 和on 8o'clock什么区别

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By8o''clock,at8o''clock和on8o''clock什么区别By8o''clock,at8o''clock和on8o''clock什么区别By8o''clock,at8o''clock和on8o''c

By 8 o'clock ,at 8o'clock 和on 8o'clock什么区别
By 8 o'clock ,at 8o'clock 和on 8o'clock什么区别

By 8 o'clock ,at 8o'clock 和on 8o'clock什么区别
应该是:
by 8 o'clock 是在8点附近,一小段时间范围内
at 8 o'clock 是在8点,只是一个时间点
on 8 o'clock 应该是不对的,没有这种用法

by 8 o'clock 是戒指到 8 点,句子多用完成时态
如:I have finished my homework by 8 o'clock
at 8 o'clock 是指在 8点
没有 on 8 o'clock

on 用在时间上是指“正点”,即每一个小时开始的那一时刻,通常表述为 on the hour of...,如 on the hour of 8 am 或 on the hour of the 8th block(= at 8 o'clock sharp)。军事上常用。