"During lunch we drink wine."

Translation: Podczas obiadu pijemy wino.

[pacecarotepatate]

Rookie question, is obiadu genitive here?

[Jellei]

Podczas czego? Obiadu, Genitive indeed.

[pacecarotepatate]

Thanks have a lingot

[SashaKW]

So, why is it genitive, if that case is used to show possession?

[JerryMcCarthy99]

The name of a case is often a simplification. One of the functions of the genitive case is indeed to indicate possession, but genitive is also used after various prepositions.

Take a look at: https://en.wikibooks.org/wiki/Polish/Prepositions_as_hints_to_declensions for more details.

[SashaKW]

Thank you for the link! I've tried to read some of these articles before, but it takes awhile for me to memorize all the exceptions.

[Andrei333403]

Dlaczego nie może być "w obiad"?

[Jellei]

It's not something any Polish person would say.

[EvaPtakov1]

Would "przy obiedzie" work here too?

[Jellei]

Sure, why not. Added.