【題目】Mary's clock is on her desk． (改為否定句)Mary's clock her desk．

【答案】isn't；on
【解析】句意：瑪麗的鐘表在她的課桌上。句子的謂語動詞是is, 構成否定句在is后面加not, is not=isn't, on不變，所以答案是isn't; on。

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