Does "if I was you" a grammatically correct phrase?
Answer from a Native speaker
Actually, it's not grammatically correct! The grammatically correct phrase is "If I were you," indicating a hypothetical or unreal situation. Since James isn't actually Dave, "If I were you" would be correct. However! "If I was you" is used a lot instead of "If I were you" by native speakers. So you'd definitely be able to use it in casual situations, and you'd probably still hear it a lot. Ex: If I were you, I would have chosen a different venue. => correct = If I was you, I would have chosen a different venue. => incorrect but used a lot