"Do not drink too much before dinner."

Translation: Nie pijcie za dużo przed kolacją.

[AlisonSinc]

I've just had 'nie pij' rejected. What is the problem?

[eviuszek]

Both "nie pij" and "nie pijcie" are correct here.

[ViktoReznov1]

what case is kolacją?

[alik1989]

Instrumental, as required by the preposition przed.

[i_see98]

why do we need to say za dużo instead of simply dużo

[Jellei]

Because English says "too much", and not "much".