Ключевые слова: academic, asking, back, blackboard, board, chalkboard, class, classroom, college, course, demonstrating, discussing, education, exam, explaining, green, hand, help, helping, individual, learn, learning, lecturer, lesson, man, mentor, mentoring, old, personal, pointing, presenting, private, pupil, questioning, school, secondary, showing, student, study, studying, teacher, teaching, trainee, training, tutor, tutoring, university, waving, young,