Translation:Sen tok musun?
why musin and not misin?
4-way vowel harmony applies to question particles (mi/mı/mu/mü/etc), so you have u's in musun because they come after the o in tok. (If you missed vowel harmony, it's introduced here: https://www.duolingo.com/skill/tr/Accusative )
of course! Its so obvious now, thanks for pointing it out me!!! :)
Why tok musunuz is incorrect?
Could you say 'sen mi toksun'?
What does it mean? that you are not hungry?
Right: it's that you're not hungry. That your stomach is full.