Tip1
(I asked somebody else and the following are right)
见面问候的时候,我们经常问:
How are you? or How are you doing?
来后知道可以这样问的:
How are you going? or How you are going? or How is going?
回答的时候,我们经常这样回答:
Fine, thank you. And you?
现在知道我们可以这样回答的:
Good. Ok. Great. or 前面加上I am....
Tip2
当你听到thank you的时候该怎样回答,我们经常说 that's all right
现在知道也可以这样说的no worries