情态动词表推测 —— It must be true. / It can't be true. · 语法要点

情态动词表推测
It must be true. / It can't be true.
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说明

must 表肯定推测（一定），can't 表否定推测（不可能），may / might / could 表可能。对过去的推测用 must have done / can't have done。注意 mustn't 表「禁止」而不是「不可能」。