"Are you walking back?"
I reported that "te visszasétaltok" seems to be wrong, and that "te visszaséltasz" should be an acceptable answer.
Sorry, that is a typo. I reported that the accepted answer mixes the singular TE with the plural verb VISSZASÉTALTOK. The program does not accept TI VISSZASÉTALTOK. I hope I am not making my confusion someone else's.
why is 'te sétalsz vissza?' wrong? i knew that we can seperate the words in question sentences?
"Te sétálsz vissza?" emphasizes "te", as in "Is it you who is walking back?" In "Visszasétálsz?", the emphasis is on the verb (naturally).
Anyway, both versions could be acceptable.