Most of the time in greetings (问候). when someone asks 'How are you'? in English. it just means (意思是) 'Hello. ' The speaker is not really asking know you feel or how you aiding. If you know someone very well. you may tell the truth (真相) about how you feel. You may say 'Bath' or 'Not so great. ' But most of the time. everyone says 'Fine? 'How am you? means 'What are you doing?'