student asking question

What is " 's" here? What is the meaning of this sentence?

teacher

Native speaker’s answer

Rebecca

The term " 's " is a contraction of "subject + is" or "subject + has". In this context, "who's" is used incorrectly and actually is a contraction of "who does". So the full sentence is "who does that guy think he is?". However, "who's" should normally be a contraction of "who is" or "who has".

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