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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...?"

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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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