"Were you drinking red wine?"

Translation: O'ch chi'n yfed gwin coch?

[OwenPr1]

Be' sy'n drwg am 'oeddet ti'n yfed s gwin coch?'

[EllisVaughan]

Nothing (assuming the "s" you included was accidental). It is already accepted by the course. Also "Dwrg" means bad for "wrong/incorrect" you use "anghywir".