否定句：The students don't have their exams in July.
一般疑问句：Do the students have their exams in July?
肯定回答：Yes ,they do.
否定回答：No,they don't.
否定句：The boy isn't working hard on his exams.
一般疑问句：Is the boy working hard on his exams?
肯定回答：Yes,he is.
否定回答：No,he isn't.
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