by和bythetimeof.比如12点之前.by12o'clock等不等于bythetimeof12o'clock?Bythetimeofherdeath在她死前等不等于byherdeath?Bythetimeof和by在表示什么之前时有什么区别?bythetime是引导时间状语

Question

by和by the time of .比如12点之前.by 12 o 'clock 等不等于 by the time of 12 o 'clock?
By the time of her death在她死前等不等于 by her death?By the time of 和by 在表示什么之前时有什么区别?by the time 是引导时间状语从句吧,那by 应该不能引导从句吧!
那　by the time of last year好像又可以换成 ,by last year?这个知识点怎么讲啊?
by the time才类似与于when吧！我问的是by the time of.网上有个这样的句子By the time of his death in 1227,he had created an empire that stretched from the Pacific coast to the Caspian Sea.

Answer 1

by 是到.为止,在.之前
My mother tell me to come back home by 10:00pm.
我妈妈告诉我晚上十点之前回家.
by the time = when 当.的时候
The bus had been away by the time I got there .
当我到那儿的时候公共汽车已经走了.