（2）Mary studies hard . Now she can't （couldn't）be sleeping . She must be studying .
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mary studies hard
玛丽学习很努力
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Mary studies hard so that she can pass the exam.
玛莉学习很努力，这样她考试就能过关了。
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。
She studies as hard as Mary he has as much money as John.
她学习努力。和玛丽一样他和约翰一样有很多钱。
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