情态助词是用来和别的动词合成谓语的,但它有自己的意思.能表示说话人对所说动作的看法,认为它可能,应当或必要等等。情态助词在任何主语后形式都是一样的;它没有人称和数的区别。情态短语都是以不定式的“to”结尾,用以补充情态助词在时态及情态意义上的不足。 A modal particle is used to synthesize a predicate with another verb, but it has its own meaning, and can represent the speaker’s perception of the motion as if it is possible, desirable or necessary, and so on. The modal particle is the same after any subject; it has no distinction between what is said and what counts. The modal phrases end with the infinitive “to” to supplement the lack of modality particles in tense and modality.