作业帮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
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?】
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
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
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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
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