what’s up要怎麼回？

可以這樣回答：

1. Awesome. 真棒！
2. Pretty good. 還不錯喔！
3. Doing okay. 還行啦！
4. Not much going on. 沒什麼特別呢。
5. It's alright. 還可以喔。
6. Same as usual. 一如既往啊。