I just graduated from high school so I am not that experienced as a teacher. But my stay in New York when I was 13-14 made my English a lot better than my peers. Since I am a language learner myself, I understand how hard it could be to learn a new language and how awkward it could be to use the wrong expressions and phrases. And that would the things I try to avoid in my lessons. Fun and easy and always the right way to use it^^