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  1. Newbie
    Student or Learner
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      • Native Language:
      • Spanish
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      • Mexico
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      • United States

    • Join Date: Jan 2012
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    #1

    What's the difference? vs What are the differences?

    "What's the difference between A and B?"
    "What are the differences between A and B?"

    Which one do you ask when you don't know how many differences there are?
    I heard my teacher said "Who has not finished...?". Does this mean the singular form is used more common? I usually don't hear "Who have not finished...?"

  2. 5jj's Avatar
    VIP Member
    Retired English Teacher
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      • Native Language:
      • British English
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      • England
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    • Join Date: Oct 2010
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    #2

    Re: What's the difference? vs What are the differences?

    Quote Originally Posted by ref1 View Post
    Which one do you ask when you don't know how many differences there are?
    The singular is probably more likely.
    I heard my teacher said "Who has not finished...?".
    'Who' as subject is followed by a singular verb.

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