Could you please explain me, is it necessary to use 在?
As I understand the meaning of these questions are: 你做什么？what do you do? 你在做什么？what are you doing?
But is it possible to ask about what another person is doing without 在 or is it obligatory? Is the meaning of 你做什么？ of doing in general or could be understood as doing right now?
Thank you very much for helping! :)