If I had been you, I would have done it. (conditional III; it describes a past , counterfactual situation; you were not him in the past so you didn't do it) The second sentence is wrong. You should use If I were you, I would do it.
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IvanhrThe second sentence is wrong. You should useIf I were you, I would do it. (conditional II; it describes a present, counterfactual situation; you're not him and, as a consequence, you will not do it)Totally agree! Unfortunately, more and more people, foreign and native alike, are beginning to view the 2nd / 3rd mixed conditional " if I were, I w