Ключевые слова: academic, adult, advertisement, background, blackboard, board, boy, business, career, chalk, chalkboard, class, classroom, college, concept, conceptual, conversation, education, elearning, elementary, english, foreign, foreigner, grammar, hand, holding, international, knowledge, language, learn, lecture, lesson, male, man, message, people, person, school, schoolboy, speak, student, study, success, talking, teaching, text, training, word, write, young,