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【题目】He wants to know why.(变为否定句)

【答案】He doesn't want to know why.
【解析】句意:他想知道为什么。因为句子中want是行为动词,主语是第三人称单数,变为否定句时,需要加助动词does构成否定,缩写成doesn't ,其结构是:主语+doesn't+动词原形+其它,所以答案是:He doesn't want to know why.

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