I've been learning Japanese for almost 4 years, and I understand a little of what they are saying. Though there's a problem for me when I hear another Japanese word instead of the one I was expecting. Let's say...The subtitle in a anime says "Yes," but when you're expecting "Hai", you hear "Un." So I guess saying "Un" is like saying "Yeah" in english. So I am sticking to the "Polite" phrases for now.
