Ключевые слова: academic, adult, back, background, basic, board, class, classroom, college, education, english, explaining, foreign, giving, grammar, indoors, information, instructor, international, knowledge, language, learn, lesson, male, man, marker, person, prepositions, profession, professional, professor, school, study, teach, teacher, teaching, text, theme, time, topic, training, tutor, university, usage, view, wall, white, whiteboard, writing, young,