I don't understand it. Why is in question "YOU ARE not married?" instead of "ARE YOU not married?" ?
I think in that case the original sentence would be 'Františku, nejsi ty ženatý?'
"František, aren't you married?" is an accepted translation.
the word order in the English translation is not natural especially after addressing Frantisek by name - we would invert and put "are you"when it is a question.