"Na pewno nie znasz tego zespołu."

Translation: Surely you do not know this band.

[dfwgator]

Yes I do.....and don't call me "Shirley."

[RobinB896941]

The Hover Hints are really confusing here: apparently na pewno can mean Surely... (as given above) - or Are you sure... ?, which is practically the opposite (or maybe just incorrect?).

Please elucidate!

[AndreOlivei]

na pewno cant also mean "really"?

[Jellei]

Maybe there would be contexts when it would mean that, but not here. Actually using "really" would make sense only if you changed the sentence into a question caused by your surprise - that is my feel.

[dUoG3]

Of course?

[Jellei]

Not really, that's "oczywiście".

[BenYoung84]

So the Polish word for band is cesspool. Excellent, that's easy to remember.

[Mark622940]

If I heard. "Surely you do not know this band" I would think it was a question, probably asked because of "surprise that you knew this band" and wanted confirmation. If I wanted to emphasise the "not knowing" I would say Definately, you do not know this band.
Definately in this instance meaning - I am sure
Almost every sentence that I can think of begining with "surely" is a question.

[BenYoung84]

No it's just a statement where the speaker is surprised. Just because you are fishing for confirmation from the listener doesn't mean that what your saying is a question.