by与until ,before区别.The ticket is valid until March.这张票的有效期一直到3月份 【by也是可以理解为到...时的意思,此时用by的话,会是怎么样概念了?】　　She lived in the house before he came back.【by也是可

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by与until ,before区别.
The ticket is valid until March.这张票的有效期一直到3月份
【by也是可以理解为到...时的意思,此时用by的话,会是怎么样概念了?】　　
She lived in the house before he came back.【by也是可以理解为在某个时间点之前,如果此句用by,会是什么样的概念了?】

前句我认为可以互换
第二句中不可用by,因为by是介词,而 he came back是句子.by 不可以引导从句,要用的话应该这样：
She had lived in the house by the time he came back.这里 he came back是定语从句,修饰time.注意 主句这时一般用完成时

by是到。。为止 比如 by the end of march。 而且时态要用过去完成时！
until 和 before 都用过去时！
希望有帮助

before,after,until的用法与区别? “到……为止”by、 until、 before怎么区别? He didn’t tell me anything ______he left.A.until B.before C.after D.since并回答提问的问题(连词before与not...until的区别) not.until 与not.beforeI could not finish the homework________.A.until he has come B.before he cameC.when he comes D.by he had come选那一个?为什么?着重介绍not until 和not..before的区别, until和before 的区别. before until之间的区别 by与until ,before区别.The ticket is valid until March.这张票的有效期一直到3月份 【by也是可以理解为到...时的意思,此时用by的话,会是怎么样概念了?】　　She lived in the house before he came back.【by也是可 until 和before的区别you can't go out ____ your work is being done是填until还是before 为什么 until和before有什么区别? not before和not until的区别 He went home ____10:00.But he didn't go to bed____11：00.A.by;by B.till;till C.by;till 为啥要填C?理由!说明by 与till,和until得区别！ by和before的区别 up until与until的区别 till·until和by的区别 by与until的区别?请说具体些,并附上例子. she had't been there before 与 she had nver been there before 有什么区别? I knew I couldn't finish my homework ( ).A.by he had come B.until he came C.when he comes D.before he comes i love you until you love me与i don't love you until you love me 的区别