Quick Learning Chinese

Introduction: Because my boy was born in USA and he was educated in a bilingual evnironment since he was a child, not only I watched his learning process, but also I looked back my english learning history, I figured out the difficulties points for a foreigner to learn a totally different language, also I know how to teach the student the way to overcome these difficulties points. The most like job I like is when I finished it and solve the difficulty problems on the working process, because it made me feel accomplishement.