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    • Member Info
      • Native Language:
      • Chinese
      • Home Country:
      • Taiwan
      • Current Location:
      • Taiwan

    • Join Date: Jan 2014
    • Posts: 64
    #1

    How did you know? vs How did you know that?

    If someone tells me something and I wonder how they knew it, should I say
    1. How did you know?
    or
    2. How did you know that?

    Also, could you please give a few contexts and tell me which of the two questions is appropriate to ask?

    Thank you.

    • Member Info
      • Native Language:
      • American English
      • Home Country:
      • United States
      • Current Location:
      • United States

    • Join Date: Dec 2015
    • Posts: 9,273
    #2

    Re: How did you know? vs How did you know that?

    Either question works. Including "that" (and stressing it) can imply "as opposed to something else?"

    Example

    A: "I see that you took the bus from downtown."
    B: "How did you know (that)?"
    A: "You're still holding the ticket!"
    I am not a teacher.

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