Refined English, pronunciation, speech. I speak and teach good refined English not simply the day-to-day English we hear that mostly is poor quality and has terrible accents. English is for all the language of the world not for a few.
Speech and drama practice with dialogues makes for excellent speakers and confident in any environment. Speech, body language and drama are great ways of learning a language and above all a great way of gaining self-confidence.
I prefer to teach adult students mostly at foundation to beginner or intermediate levels. Since I am very particular with details and correction it sort of fits better with my style. Having said that I have the capacity to chat for long so advanced English students feel comfortable too.