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情态动词must 无词形变化,不能表示多种时态,在一些情况下用have to 来表示;又因must 含有较多的词汇意义,有时作“必须”、“应该”解释,而有时又作“必定”、“一定”解释,其否定式mustn’t的词汇意义有变化,表示“禁止”、“不可以”、“不应该”等,而表示must 的否定式之一的needn’t,don’t need to 中的need 既可作情态动词,又可作行为动词。所以,其否定式就变得比较复杂。现归纳如下:1.must 表示现在时和将来时,词义为“必须”、“应该”,如:
The modal verb must have no morphological change. It cannot express a variety of tenses. In some cases it is represented by have to; because must contains more lexical meanings, it is sometimes interpreted as “must” and “should”, and sometimes it is The “must” and “certain” explanations have changed the lexical meaning of negating mustn’t, indicating “forbidden”, “not possible”, “not supposed”, and so on, but expressing necessity as one of the negations of must. The need in don’t need to can be used both as a modal verb and an action verb. Therefore, its negative formula becomes more complicated. These are summed up as follows: 1.must denotes the meaning of the word “must” and “should” in the present and future. For example: