i think that all the material that a cuold find, any of those tell something concise, or something spotting tho direct point of which are the roles of a teacher, none of them including yours, show me the exact roles that a teacher has to fulfil en the classroom towards its students. please a really need information about roles of teachers, i will really apreciatte your information, thank you, and it is not irelevant your text but in my opion there is information that is missing here, and this information is very important, however i am not unsatisfy with your informed text.