Questions & Answers about Nieźle znam te piosenki.
Literally, nieźle means not badly, but in real usage it often means quite well, pretty well, or decently.
So Nieźle znam te piosenki is not usually negative or lukewarm. It often sounds like a modest, slightly understated way of saying I know these songs fairly well.
Polish often uses this kind of negative-looking form with a positive meaning.
Znam is the 1st person singular form of the verb znać, which means to know, to be familiar with, or to know well.
Conjugation of znać in the present tense:
- (ja) znam – I know
- (ty) znasz – you know
- (on/ona/ono) zna – he/she/it knows
- (my) znamy – we know
- (wy) znacie – you all know
- (oni/one) znają – they know
Here, znam tells you the subject is I, even though ja is not stated.