If I were you

From Teflpedia

If I were you (/ɪf aɪ wə ju:/) is an if clause (i.e. a type of conditional clause) used for giving advice. It can be used either as a second conditional to advise about the present or future (e.g. "If I were you, I would do something about it"), or as a present condition, past consequence mixed conditional to castigate someone about the past (e.g. "If I were you, I would have done something about it").

Native speakers often say "If I was you" (/ɪf aɪ wəz ju:/)- thus ignoring the subjunctive. This may be considered an error, but it’s not a big one.

It’s also possible to give advice using inversion, e.g. "Were I you".

It’s possible to say "If I had been you" to make a full third conditional sentence, though often a present condition, past consequence mixed conditional is arguably better.

The similar "If I were in your position" (substitute position for place/situation), does however transform to "If I had been in your position". "Were I you" changes to "Had I been you".

As language for giving advice, there may more sympathetic ways of giving advice. Maybe there’s a more technical name for this like "empathetic advice".