How to be a successful English teacher at junior high school.

Mr. M's class tought me a lot of things. He said teacher's work is changing students, and teacher have to satisfy themselves how to use english and what is English. When I was at junior high school, I could not understand english well, becouse I was not satisfied it. For example, I could not tell 'a' from 'the' s strict difference. So I suggest to take care of satisfying to teach english.