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助动词和情态动词均为英语中的特殊动词,即:不可在句子中单独使用,必须和实义动词一起构成复合谓语。助动词本身没有意义,仅仅用于帮助普通动词表示时态、语态、语气以及构成否定式或者疑问式等。情态动词虽然具有自己的词汇意义,但是要与不带to的普通动词不定式一起使用,它所表示的是说话人对所谈及动作和事物的态度和看法,认为其可能、应该或者必要等等。
Auxiliary verbs and modal verbs are special verbs in English, that is: can not be used alone in sentences, and verbs must be used together to form a compound predicate. Auxiliary verbs are meaningless in themselves and are used only to help ordinary verbs to express tense, voice, tone, and form a negative or questioning type. Although modal verbs have their own lexical meanings, they should be used in conjunction with infinitive ordinary verbs without to, which indicate the attitudes and perceptions of the speakers about the actions and things they are talking about, believing that they may, should or may not be necessary Wait.