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BNC: 198 COCA: 219
before
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adverb, conjunction, preposition /bɪˈfɔː(r)/
Before can be used in the following ways: before 有以下用法
as a conjunction (connecting two clauses): 用作连词（连接两个分句）: Think carefully before you choose. 你作出选择之前仔细考虑一下。
as a preposition (followed by a noun): 用作介词（后接名词）: We moved to London before the war. 我们在战前搬到了伦敦。
as an adverb (without a following noun): 用作副词（后不接名词）: I'd met him once before. 以前我见过他一次。
  1. 1
    earlier than something
    1. a.
      earlier than a particular time, event, or action 在（某个时间、事件或动作）之前

      I went for a run before breakfast. 我早饭前去跑步了。

      The others had got there before us. 其他人在我们之前到了那里。

      Won't you have another drink before you go? 你走之前不再喝一杯吗？

      I joined the police in 1999. Before that I was in the army. 我于1999年成为警察。在此之前我在部队。

      Two weeks before the election the first reports of the scandal began to appear. 选举前的两个星期开始出现丑闻的最初报道。

      before doing something :

      You should seek legal advice before signing anything. 在签字之前你应该进行法律咨询。

       Synonyms and related words
      Before a time or event: before, first, early...
    2. b.
      at a time in the past 以前；以往；在过去某个时间

      Haven't we met before somewhere? 我们以前是不是在哪里见过面？

      Never before in modern history has one nation dominated the world so completely. 在近代史上以前从来没有一个国家能够完全主宰世界。

       Synonyms and related words
      Existing, happening in or relating to a time in the past: past, ago, previously...
    3. c.
      used for saying how much time passes until something happens （用于表示在某事发生之前已经过去多长时间）

      Several years went by before I realized that David had lied to me. 几年之后我才意识到戴维对我撒了谎。

       Synonyms and related words
      General words referring to time: then, all, last...
  2. 2
    used for saying that something happens which prevents someone from doing what they intended （用于表示发生的事使某人无法做打算做的事）

    Before I could think of a reply she walked away. 我还没来得及想出如何回答，她就走开了。

  3. 3
    spoken used for warning someone that something bad may happen unless they do something （用于警告）免得，要不然

    Clean up that mess before your father sees it. 快把这乱糟糟的东西收拾干净，免得让你父亲看见。

    You'd better go away before I lose my temper. 你最好离开，不然我要发火了。

     Synonyms and related words
    Ways of warning or advising someone: beware, watch it, mind (out)...
  4. 4
    for someone to consider or watch
    1. a.
      formal used for saying that something or someone is judged or considered by a group of people 由…审判（或考虑）

      The case went before a grand jury on December 17th. 这个案件12月17日由大陪审团审理。

      The question before us is whether we should allow a foreign government to control our commerce. 摆在我们面前的问题是，我们是否应该允许外国政府来控制我们的商业。

    2. b.
      formal used for saying that something is happening where people can watch it 在…面前

      The team scored an impressive victory before 76,000 fans at Arrowhead Stadium. 球队在阿罗黑德体育场76,000名球迷面前获得了令人难忘的胜利。

  5. 5
    in front of or earlier than someone/something
    1. a.
      if one place is before another place on your journey, you come to it first （某地点）在…前面

      A few miles before the border we were stopped at an army checkpoint. 在距边境几英里的地方我们被军队的检查站拦住了。

      Our house is just before you get to the end of the road. 我们的房子就在路尽头。

       Synonyms and related words
      Function words referring to location: about, across, after...
    2. b.
      formal in front of someone or something 在（某人或某物）面前

      Lawrence knelt before the king. 劳伦斯跪在国王面前。

      Before the temple gate stood a bronze statue of Buddha. 在庙宇大门前矗立着一尊铜佛像。

       Synonyms and related words
      Function words referring to location: about, across, after...
    3. c.
      used for saying that something is placed earlier than something else in a list or series （在列表或一系列物件中）在…之前

      The names are in alphabetical order, so ‘Barnes' should come before ‘Brown'. 名字是按字母顺序排列的，所以Barnes应该放在Brown的前面。

  6. 6
    formal used when saying what will happen in someone's future （表示未来将发生的事）等待着，摆在面前

    A promising career stretched out before him. 摆在他面前的是一份很有发展前途的工作。

    You're still young – you have your whole life before you. 你还年轻，你的整个人生正等待着你。

     Synonyms and related words
    At an unspecified time in the future: later, someday, sooner or later...
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