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before和by(不迟于…,在…之前)如何区别?是不是后面加的时间不同?

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before和by(不迟于…,在…之前)如何区别?是不是后面加的时间不同?
efore与by
before 指“在……之前” :
Please come before ten o'clock.请10点以前来.
by 指“在……前(时间);截至(到)……”:
How many English books had you read by the end of last year?到去年年底以前你看过多少本英文书?
表示“在……以前”时,before 与 by 基本可通用.但 by 还有“截至……为止”之意:
How many models have you made by the end of last month?截至上月底你做了多少个模型?