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BNC: 54 COCA: 57
when
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adverb, conjunction /wen/
When can be used in the following ways: when 有以下用法
as a conjunction (connecting two clauses): 用作连词（连接两个分句）: When he saw me, he waved. 他一看到我就向我挥手。
as a question adverb (introducing a direct or indirect question): 用作疑问副词（引导直接或间接疑问句）: When shall we meet? 我们什么时候见面？ Do you know when these houses were built? 你知道这些房子是什么时候建的吗？
as a relative adverb (referring back to a noun and introducing a relative clause): 用作关系副词（回指前面的名词或引导一个关系从句）: I remember the day when the war began. 我记得战争开始的那一天。 (introducing a clause that is the subject, object, or complement of another clause): 引导一个作另一个分句的主语、宾语或补语的从句: My proudest moment was when I received the poetry prize. 我最自豪的时刻是我得到诗歌奖时。
  1. 1
    at what time or in what situation
    1. a.
      used for asking at what time something happens 在什么时候

      When will we know our test results? 我们什么时候能知道测试结果？

      When did the trouble start? 这次麻烦是什么时候开始的？

      I asked him when he was going to start work. 我问他准备什么时候开始工作。

      ‘You'll get your money back.' ‘Yes, but when?' “你会拿回你的钱的。”“不错，但是什么时候呢？”

      since when :

      Since when have you been in charge of the project? 你是从什么时候起负责这个项目的？

       Synonyms and related words
      Ways of asking questions and making requests: after you, any chance of...?, any luck?...
    2. b.
      used for asking in what kind of situation something happens 在什么场合；在何种情况下

      When should I end a letter with ‘Yours sincerely'? 我该在什么情况下在信尾用 ‘Yours sincerely’？

      When is it OK to hug someone that you've just met? 在什么情况下与刚刚见面的人拥抱是合适的？

       Synonyms and related words
      Ways of asking questions and making requests: after you, any chance of...?, any luck?...
    3. c.
      used when someone knows or says at what time something happens, or in what situation it happens 在…的时候；在…情况下

      He didn't say when they would leave. 他没有说出他们什么时候将会离开。

      It is important to know when you have had enough to drink. 知道自己能喝多少很重要。

       Synonyms and related words
      General words referring to time: then, all, last...
  2. 2
    at the time that something else happens
    1. a.
      as soon as another action or event has finished 一…就…

      When it stops raining, I'll show you the garden. 雨一停，我就带你去看花园。

       Synonyms and related words
      After another event or time: after, following, since...
    2. b.
      at the same time as something else 在…的同时

      I always wear a hat when I work in the garden. 我在花园干活儿时总是戴着帽子。

      when doing something :

      She was often nervous when facing the camera. 她面对照相机时常常很紧张。

       Synonyms and related words
      Happening or done at the same time: when, while, simultaneous...
    3. c.
      at a point during the time that something else is happening 当…时

      She claims she was at a friend's house when the shooting took place. 她声称发生枪击时，她在一个朋友家里。

       Synonyms and related words
      General words referring to time: then, all, last...
  3. 3
    used for talking about a particular time or situation 在…时，在…情况下（用于谈论某个时间或某种情况）

    The biggest surprise for Josie was when she was chosen as team captain. 最令乔西感到意外的一刻是她当选为队长的时候。

    the time/day/year etc when :

    Do you remember the time when we took your mother camping? 你记得我们带你母亲去露营的时候吗？

    There are some days when everything seems to go wrong. 有一段日子各种事情好象全都出错。

     Synonyms and related words
    General words referring to time: then, all, last...
    Usage note: when
    When can be left out or replaced by ‘that' when it follows a noun and introduces a relative clause: 当 when 紧随名词之后并引导关系从句时，可以省略或用 that 代替： I remember the day (that) we first met.我记得我们第一次见面的那一天。
  4. 4
    used for introducing a situation that makes someone's action or behaviour seem surprising 虽然，既然（用于引出使某人的行为看似出人意料的情景）

    Why does she always drive to work when she could easily take the train? 她去上班明明坐火车很方便可为什么总要自己开车呢？

    He went on protesting his innocence when he was obviously guilty. 很明显他有罪，但他继续申明自己无罪。

  5. 5
    used for making a general statement about something that is always true or correct 当，如果（用于作出某事总是正确或属实的概括）

    We use ‘an' when the next word begins with a vowel. 当下一个单词以元音开头时，我们就使用an。

    Tonic water makes a refreshing drink when served with ice and lemon. 奎宁水和冰、柠檬混在一起喝令人精神振奋。

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