Formal:
* What are you doing? This is the most common and neutral translation.
* What are you working on? (if the context is about work or a task)
Informal:
* What's up? (A casual greeting)
* Whatcha doing? (A more casual way to ask what someone is doing)
Note: "Gawa" can also be translated as "work" or "make," so the exact meaning of the phrase depends on the specific situation.