"I am answering the question."
Translation:Odpowiadam na pytanie.
Not related to just this question but. After I have correctly answered a translation question I'd like to be able to replay the whole sentence to check pronouncation. Is it possible to add this feature. I fibd I can read polish much better than speak it, and listening while reading certainly helps.
That is not something we can do, if you'd like to suggest a feature you should create a post in the "Duolingo" subforum :)
na + acc? I've got all the na usages written down from wiki. I don't see this particular application.
Well, it's hard to list all the usages of a preposition, especially given the fact how prepositions differ between languages...
We could say that from Wiktionary, it's "(+ accusative) for, to deal with" - even if English uses 'to', and not 'for'. Anyway, "odpowiadać na" definitely takes Accusative.