heisatschool改否定加疑问句，并回答
he---He
He is at school.
否定句：He isn't at school.
一般疑问句：Is he at school?
肯定回答：Yes, he is.
否定回答：No, he isn't.
特殊疑问句：
Who is at school?
Where is he?
He is not at school. Is he at school? No,he is not at school. 或者No,he isn't.
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