One problem may teacher face is that students use their native language rather than
English to perform classroom tasks. This might happen because they want to communicate something important, and so they use language in the best way they know. They have difficulty to say something and because they do not want losing their face in front of their
peers, they think that they better use their native language and so others can understand them. This problem also connected with students does not want to talk or say anything in the foreign language but they keep using their own language. In this situation, teacher can create an English environment and keep reminding them always use English.