"Please, drink more wine."
Translation:Bitte, trinken Sie mehr Wein.
I can also tell to a well-known person: "Bitte, trinke mehr Wein". Unfortunately, it was not accepted and I have reported it as an answer, which is correct, too.
I think, Duolingo is having problems with the correct German imperative form "trinke" again. (-;
Edit: Really, Duolingo accepts only the imperative form: trink and that is wrong.