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15．David and Kate are friends．（變為否定句）
David and Katearenot friends．

分析 --戴維和凱特是朋友．
--戴維和凱特不是朋友．

解答答案：are not．考查否定句．含有be動詞are的句子，變否定句直接在are后加not．意思是"不是"，答案是are not．

點評考查否定句．通常是在be動詞，情態動詞后加not．一般現在時態，主語不是第三人稱單數用don't，主語是第三人稱單數用doesn't．一般過去時態用didn't．還有其它用法需要牢記．

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