情态动词 the notebook_________ be Ming's.it was onn her desk.

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情态动词 the notebook_________ be Ming's.it was onn her desk.
the notebook_________ be Ming's.it was onn her desk.
本题是有关情态动词表推测的.毫无疑问,空累可以填must或might.
根据情态动词表示推测的用法,must be 表示“一定是”,可能性为100%,
而 could be 和might be表示“可能是”,可能性为“20%~80%.
can't be 表示'不可能是”,可能性为0.
为什么上面的题中不能填 could
还有两题;
the soccer ball_______ be John's or Tony's.they both play soccer,don't they?
这题为什么不能填 could 人教版教参只给出might.
我的问题是标准答案只给出must和might.那could为什么不行呢?

分析：
may（might）,must,can（could）均可以表示推测.
但can (could),may (might),must 表“推测”时所适用的句式的区别：
can (could) 一般用于否定句,表示不能,
could be表示对过去的推测,可能.
must一般仅用于肯定句,不用于否定句和疑问句,表示肯定的推测,语气最强 .
may（might）,也许,可能,比较婉转,语气最弱,一般不用于疑问句.
此句并非表示对过去的猜测,且句子均为肯定句,根据习惯一般不用could.

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