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  1. englishhobby's Avatar
    • Member Info
      • Native Language:
      • Russian
      • Home Country:
      • Russian Federation
      • Current Location:
      • Russian Federation

    • Join Date: Jun 2009
    • Posts: 1,681
    #1

    I can't find the key. I mustn't have taken it.

    Is this sentence ambiguous? Is must used properly here?

    I can't find the key. I mustn't have taken it.
    If I were a native speaker of English, I would never shut up. :-)

    • Member Info
      • Native Language:
      • English
      • Home Country:
      • England
      • Current Location:
      • England

    • Join Date: Jun 2010
    • Posts: 24,501
    #2

    Re: I can't find the key. I mustn't have taken it.

    It's not ambiguous, and 'must' is used properly if you mean 'I mustn't have brought it' or 'I must have forgotten to bring it' if you are fairly sure that you have left it behind.

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