（2）Mary studies hard . Now she can't （couldn't）be sleeping . She must be studying .
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she must be studying
她一定在学习
以上为机器翻译结果，长、整句建议使用 人工翻译 。
She must be studying in the library.
她一定正在图书馆学习。
youdao
Mary studies hard. Now she can't (couldn't) be sleeping. She must be studying.
玛丽学习努力，现在她不可能在睡觉，她肯定正在学习。
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