The document discusses the various roles that teachers play in the classroom, including controller, organiser, assessor, prompter, participant, resource, tutor, counsellor, monitor, and researcher. As a controller, the teacher focuses all student attention at the front of the class and ensures students work at the same pace, doing most of the talking. As an organiser, the teacher plans activities, provides instructions and models, and organises feedback. As an assessor, the teacher provides both correction and gentle feedback, assessing task completion and linguistic accuracy.