Ключевые слова: adjective, blackboard, board, caucasian, chalk, chalkboard, class, classroom, college, course, education, ending, english, exercise, foreign, form, future, grammar, grammarianpresent, green, indefinite, ing, knowledge, language, learn, lecture, lesson, notes, noun, past, progressive, rule, rules, school, seminar, sentence, simple, student, study, suffix, teach, verb, word, words, work, write, writing,