[bread_baker]

I teach adults. In the first class meeting of a term, I explain my expectations. I repeat this information in the second week, because I always have students who add the class. A lot of the students seem to cooperate. They understand that I am serious about teaching, and serious that they learn. The problem students are usually those who are taking the class as a social activity. They really aren't too concerned about learning English. They are there to find or be with a girlfriend or a boyfriend.
I have an idea about coping with a student who continues to speak his/her native language almost all the time, in spite of the many times I tell the person to not do that, and to speak English. I change the seating. I put the problem person between two other students who don't speak the same native language as the problem student!