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He is going to buy a book变为否定句和一般疑问句.做两种回答

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He is going to buy a book变为否定句和一般疑问句.做两种回答
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答案和解析
He isn't going to buy a book.( isn't=is not)否定句
Is he going to buy a book?一般疑问句
Yes,he is.肯定回答
No,he isn't.否定回答