4.1 High School Excellent English Teacher Classroom Instruction Vocabulary Characteristics<br> Vocabulary refers to "a collection of all words and idioms in any language" (Richards, 2002:265). The lexical characteristics of a teacher's instruction refer to the characteristics of a word or idiom used in a teacher's instruction. In the current study, a variety of words have been used in teacher instructions. From human pronouns, emotional verbs, Wh-words, let's explore the unique vocabulary characteristics of teacher instructions:
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