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

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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。

By 8 o'clock ,at 8o'clock 和on 8o'clock什么区别 at...o'clock 和 by...o'clock 辨析. by 8 o'clock什么意思英语：by around eight o'clock是否等于at about eight o'clock?英语：by around eight o'clock是否等于at about eight o'clock? by ten o'clock 8 o'clock中的 12o'clock at She has finished all her work by 8 o'clock. They must _____(be)at school by eight o'clock Pick me up at 8o'clock.I will have finish my work by then.这句话对吗 Pick me up at 8o'clock. I will have over my bath by then.这句话对吗英语翻译{ } { } you usually{ } { } { At{ }8:00 o'clock Our ___(one) class starts at 8'o clock. We start lessons at 8 o'clock .(改为一般疑问句 ) i often go to school at ____ 8 o'clock what were you doing at 8:00 o'clock?we____. Shall we meet at a ____ 8 o'clock? i usually start (work at 8 o'clock).划线提问