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This study explores the suitability of ChatGPT as a support tool in English education by analyzing its linguistic characteristics in learning environments. The researchers conducted a corpus analysis of ChatGPT's responses to questions derived from English textbook passages used by middle and high school students. The analysis focuses on lexical aspects of vocabulary level, diversity, and word length, as well as syntactic features including sentence length and FKGL index. The study results indicate that the vocabulary generated by ChatGPT meets middle school standards with considerable diversity and average word length of four letters. Its sentence structures and readability align with those of 16-year-old native English speakers. These findings suggest ChatGPT's potential as a linguistically appropriate AI tool for English education.