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情态动词表达我们对某事的确定程度。"Must" 表示强烈的肯定确定性，"can't" 表示强烈的否定确定性，而 "might/may/could" 表示可能性。
He mustn't be at home, his car is gone.
He can't be at home, his car is gone. — 表示强烈的否定确定性时使用 "can't"，而不是 "mustn't"。
She might to be late.
She might be late. — 情态动词后面绝不能用 "to"。
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