the subject verb agreement is with 'you' in the first question and 'the man' in the second. Questions using the verb 'to be' have inverted word order. The statement word order for these questions would be 'you are drinking (something)' and 'the man is doing (something)'.
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zolikyCan someoneIt's because of the word you. In questions, think of are you as a unit.Someoneexplainmewhy the first question uses "are" instead of "is"?