题目内容
【题目】Mary's clock is on her desk． (改为否定句)Mary's clock her desk．
【答案】isn't；on
【解析】句意：玛丽的钟表在她的课桌上。句子的谓语动词是is, 构成否定句在is后面加not, is not=isn't, on不变，所以答案是isn't; on。
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【题目】Mary's clock is on her desk． (改为否定句)Mary's clock her desk．
【答案】isn't；on
【解析】句意：玛丽的钟表在她的课桌上。句子的谓语动词是is, 构成否定句在is后面加not, is not=isn't, on不变，所以答案是isn't; on。