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Verbal nouns and past-tense adjectives from imperfective & perfective verbs..when to use which aspect? [48]
but what are differences between imperfective vs. perfective verbal nouns?
Basically the same as verbs.... the best aid I ever heard was for Czech (but it works in Polish too).
perfective - you're thinking of the event from its ending/completion
imperfective - you're thinking of the process
coś do zobaczenia - something to see (and then its done)
coś do widzenia - something to look at... (stressing the process of seeing it)
It's the same thing with the past participles...
Adam był zobaczony w mieście = Adam was spotted in town
Adam był widziany w mieście = Adam was seen (more than one place) in town.
hint: rephrase the sentence so that the noun or adjective/participle is a plain verb and that's the form you use.
Zobaczył Adama w mieście (He saw Adam (once) in town)
Widział Adama w mieście (He saw Adam (more than once) in town)