what’SUP 要怎麼回覆？

可以這樣回答：

1. Fantastic. 真棒！
2. Pretty good. 滿不錯的！
3. Not too shabby. 還行嘛！
4. Not much going on. 沒什麼特別的。
5. It's okay. / Just the usual. 還可以啊 / 就是這樣。
6. Same as always. 一樣的老樣子。