The difference between -나요 / -ㄴ가요
Hello guys. First of all I'm a native Korean speaker.
Though I'm a native, I ask what the difference is between -나요 / -ㄴ가요 because I didn't find it anywhere.
In my understanding, I think -나요 is more casual than -ㄴ가요. But sometimes it doesn't make sense in some sentences that these two particles can have same meaning.
ex 1. 작나요? 작은가요?
ex 2. 바쁘나요(x) 바쁜가요(o)
If there is someone who knows about it please tell me.