 Essential role of an EFL teacher, creating classroom environment. Teachers also play an important role in the classroom when it comes to the environment. Students often mimic a teacher's actions. If the teacher prepares a warm, happy environment, students are more likely to be happy. An environment set by the teacher can be either positive or negative. If students sense the teacher is angry, students may react negatively to that and therefore learning can be impaired. Teachers are responsible for the social behavior in their classrooms. This behavior is primarily a reflection of the teacher's actions and the environment she sets.