Is it possible to greet someone asking "How is doing?" When I was in US, many times I heard a phrase "Hi! How is doing?" or maybe it was a misunderstanding and the phrase was "How are you doing?"
This question is related to When someone asks how are you, are you supposed to answer, "Good," or "Fine," and ask back?. There, the answer by z7sg Ѫ claims it is sometimes appropriate not to ...
When someone asks, "How are you?" are you supposed to answer, "Good," or "Fine," and ask back?