Some example sentences using each of the cases in Polish

Declension of some Polish nouns:
In polish language there are 7 declensions:

Mianownik (kto? co?) pies (singular), psy (plural), kolega (sing), koledzy(plu)

Dopełniacz (kogo? czego?) psa " psow " kolegi " kolegow "

Celownik (komu? czemu?) psu psom koledze " kolegom "

Biernik (kogo? co?) psa psy kolege kolegow

Narzędnik (kim? czym?) psem psami kolega kolegami

Miejscownik (o kim? o czym?) psie psach koledze kolegach

Wołacz! piesku! pieski! kolego! koledzy!


and your answer why:
Biernik (kogo? co?) psa psy kolege kolegow
kogo?co? = whom/what can I see/I have?

Ella, thanks for the grammar lesson. I think, I had it in 4th, 5th and so on grades...
I would not be able to explain it, like you did. I totally forgot what narzednik is!

"Narzednik" = instrumental case, much as the Polish word meaning "tool", i.e. "instrument"!
Marek

This is not an answer at all, you are simply saying the same thing as me. You have given the rules, that is simple but why is this an exception in this particular case?

The accusative case, biernik, for masculine nouns, is divided into two categories: animate, and everything else; but this is only in the singular. In the plural, the division is between masculine personal (ie men and groups containing men), and everything else. So pies goes into the exceptional category animate in the singular, but into the everything else category in the plural. Dogs are animate but they are not men.

This is more to the point.