[Course 2 Lesson 9]
Casual Japanese is an important part of speaking Japanese. However there are rules that must be followed. This is part 1 of 3 but video 52 of the larger series teaching Japanese. I assume you understand what has already been taught!
Learn Japanese Online: http://YesJapan.com
Japanese From Zero! (http://yesj.us/I) book series written by George Trombley and Yukari Takenaka