---It's seven o'clock already.Mary____be home by now.情态动词的用法?

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---It's seven o'clock already.Mary____be home by now.情态动词的用法?

---It's seven o'clock already.Mary____be home by now.情态动词的用法?
---It's seven o'clock already.Mary____be home by now.
情态动词的用法?

---It's seven o'clock already.Mary____be home by now.情态动词的用法?
must
BE后面是不是少了个介词AT?

should 直接be home也是回家的意思

must
现在已经7点了.Mary现在一定在家.
must 强调肯定,理所应当

我觉得要根据当时的情景回答来选择使用的情态动词,如果强调肯定,当然就用must
但如果像“我想去她家,但不知道她是否在家时”你也可以对自己说,……may(might)……
综上所述,回答此类问题要根据当时的情景。