I think that students prefer to study in a foreign teacher or Thai teachers There are many factors that teaching pronunciation, grammar, or possibly understand. I agree with elizabeth and Mcohoe that said non native speaker grammar than native speaker and agreed to elizabeth, Vaji and Menesh said native speaker can pronounce better than non native speaker which actually we won't be able to recognize that most of the students prefer to study with anyone over. I have conducted research in this field, so they can take to improve teaching and learning. Students are very interested in learning more stroke of insight. If he is able to enjoy a teacher of English.