问做什么事情，就用 what about you
问怎么样或怎样做，就用how about you
carlos19900105 的例子能说明区别：
例（1）
A：i like english ,chinese and math, what about you?
B：me too。
此例中A 问对方喜欢“什么语言”，即: I am asking "what language", and the question is "about" you --- what language you like。 所以：What about you?
例（2）：
A：i take school bus go to school,how about you?
B：bike。
上
此例中A 问对方怎样去，即：I am asking "how to go to school", and the question is "about you" --- how you go to school。 所以： How about you?。
