问题描述：
Mr smith is making sandwichea改为否定句,一般疑问句,肯定
Mr smith is making sandwichea改为否定句,一般疑问句,肯定答语,否定答语
Mr smith is making sandwichea改为否定句,一般疑问句,肯定答语,否定答语
问题解答：
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