It's like saying hi. You can respond, but your response may mean as little as just saying hi also. For example, even if you your girlfriend just broke up with, in response to "hey Jason, how'ya doing?", you may say any of the following: "great" "good, good, and you?" "hey man, what's up?" If it's a friend, you might respond in more detail. Basically it's up to you, but it doesn't necessarily mean anything. ※ 引述《jasonlurey (我非我)》之铭言： : First of all, : I know "how're you doing?" is the same as "how are you doing" XD : What I want to know is... : when a person said this at the start of his/her conversation, : does he or she really expect a response like "Fine" or : it's just another way of saying "Hi" ? : Thx in advance. --

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