This book ___ Lucy's.Tom's name is on its cover.A.can't be B

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This book ___ Lucy's.Tom's name is on its cover.A.can't be B.mustn't be C.may not be
选啥,
还有一个辨析的
may be not 与may not be 有区别吗

A：can't “不可能,一定不…” 如He can't know this.
B：mustn't “不许（表示禁止做某事）”如You mustn't park here.
C：may not be “或许不…”如He may not know her address.
此句意为“这本书【不可能】是Lucy的.因为书的封皮上是Tom的名字.”所以选A.
辨析：①may not be 中的may是情态动词、用法类似于情态动词can：后加动词原形,表否定时直接在情态动词后面加not +动词原形.当二者都表示“可能”时、其区别在于may用于肯定句、can用于否定句.所以上面的选择题中C项意为“【或许不】”、而不当“不可能”讲,因为may表示“可能”时用于肯定句.
②may be not这样三个单词的说法中的may是情态动词,在句中构成主系表结构,如He may be not a soldier.他【可能不是】军人.
再问：你看看这个 http://zhidao.baidu.com/question/165702232.html 是不是真的有这种用法额？
再答：老外的语言论坛上也有过关于这个问题的帖子~如： ①She may not be at school. => There's a possibility that she is not at school. ②She may be not at school, but ... => True, she is not at school, she's at home, but she's at home studying right now as if she were in school. 又如：Rainy days may be not the most beautiful,but to say love to ... 所以这种说法也可以~ 否定词not具体放在哪种位置，也要根据说话人想要强调的意思而定~

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