如果你过得很好： i'm ok/good/great/fine/fantastic/perfect. i couldn't be better. very well. cool. wonderful. super. terrific. 如果过的一般： not bad. so so. can't complain. you should understand that these greetings are formalities which serve to start the conversation off, rather than a true enquiry about the person's health. 其实这些都是礼节性的问候，用于开始一段对话，和中国人说“你吃了没？”有异曲同工之妙，说话者并不是想真正得到你的答案，所以以上的答案就够用了，切忌回答一大篇。如果对方是真的想知道你的近况，他会问的比较具体，如"how's work?”“how's your family?""are you feeling ok,you don't look so well?"etc.

意思是问候：你怎么样啊？ 那么你的回答就可以是：I am doing good/I am fine. 就是这样喽~

Same as "how are you?"