I was a qualified English teacher, I taught English literature, language, computer science, science and even PE. I would totally disagree, an English teacher should only speak English to their students and have the ability to xplain in English (I had 3 autistic children in one of my classes). I saw far to often English teachers using their students to learn and practice their Thai and that is not what the children's parents were paying for. I also use the same ethos with my children, I only speak English to them and their mother speaks Thai to them. I now have bilingual children. I was only paid 40,000baht but I wasn't teaching for money to live on just for the pleasure. However, when it became to much of a hassle, I stopped which was after the Mr T. coup. I noticed a change in attitude of schools to native English teachers who were replaced with cheaper Philippine T ing glish teachers. Thailand went from rising English proficiency to the state it is in now. Note: not once did I ever get a work permit from the schools I worked in, it was always "we applying, you get soon"...