Why can't you put nerede at the end?
I can not use yaşıyor in this case?
but it did not work, it was marked as a false answer
My response was correct: "Onlar nerede yaşıyor?" (DL accepted 16/03/2018).
It was marked wrong....
I can't put onlar after nerede?
You cannot use the word "onlar" after "nerede". It sounds weird. But you can say "Nerede oturuyorlar."
So are yasmak and oturmak interchangeable?
I believe so