What are you doing?
What are you doing now?
Where are you going?
Who are you going with?
Let's go together.
What do you do after that?
'뭐를' is grammatically fine too, but in everyday speech '뭐 해요?' sounds much more natural.
1. Fill in the Blank
3. Answer the Question
자연스러운 질문
이번 주 핵심 받침