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If conditional marker
you guys subject with supplemental specification
can't form modal + bare infinitive of "form"
a simple phrase direct object (indef. article + adj. + noun)
in preposition of...

Yes, cases are not like German, where you had aus bei mit nach seit von zu and those were all the preopositions that governed the dative. Russian has a lot more. But, as I and the Canadian have...

What textbook are you using? Maybe you are trying to get ahead of yourself -- take it step by step and you will get the cases one at a time, with the easy ones first!
Should be: Język polski