What about saying "nem táncolhatok" ? Would it be unnatural/wrong to say it like this? And what, if any, perceived difference is there between "nem tudok ---ni" versus "nem ---hatok", etc. ? Előre is köszönöm.
The correct conjugation for that would be "Nem lehet táncolnom." or "Nekem nem lehet táncolni.". It does sound unusual though and it means something like "It's impossible for me to dance." which seems just about as awkward in English.
Could I not say Nem tudom táncolni? I was scored incorrect with that. In English, "I can't dance" often means the person is saying he/she doesn't know how to dance, not that he/she is not allowed to dance.