what about you?和
how about you?都可译成
“你呢?”不过 how about you 也有一层你怎么办/做的意思
比如说：
I'm going out for lunch!What about you?
我现在出去吃午饭!你呢?
I have a solution to this problem!How about you?
我对这个问题有一个解答了!你怎么办呢?