Can't 、mustn't 、shouldn't 的区别?（急）

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Can't 、mustn't 、shouldn't 的区别?（急）
比如一句句子：
He ______ be in the room,I didn't see him.
莪知道要用can't,但是为什么呢?为什么不用mustn't 、shouldn't

can't 不可能,不太可能（表示推测某事发生的可能性非常低）
mustn't是指不准,不许
例句：you mustn't tell Jerry what I have bought不准你告诉杰瑞我买了什么,不能用于推测
shoudn't是指不该,不应该..（认为做某事不对）
you shoudn't come here
你不应该来这
He can't be here,I didn't see him
表示推测他在这的可能性还小,所以用can't

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