Ключевые слова: background, blackboard, case, class, classes, color, communication, concept, copy, course, courses, education, english, flat, foreign, grammar, grey, grunge, international, knowledge, language, lay, learn, learning, lesson, linguistics, markers, native, nobody, notebook, object, pencil, pronunciation, pupil, red, school, space, speak, stationery, student, study, studying, subject, teach, teaching, text, top, tutor, view, word,