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An auxiliary verb (abbreviated aux) is a verb that adds functional or grammatical meaning to the clause in which it occurs, so as to express tense, aspect, modality, voice, emphasis, etc. Auxiliary verbs usually accompany an infinitive verb or a participle, which respectively provide the main semantic content of the clause. [1]
The first English grammar, Bref Grammar for English by William Bullokar, published in 1586, does not use the term "auxiliary" but says: All other verbs are called verbs-neuters-un-perfect because they require the infinitive mood of another verb to express their signification of meaning perfectly: and be these, may, can, might or mought, could, would, should, must, ought, and sometimes, will ...
3 Two Word Semi-Modal Auxiliary Verb Phrases. ... This is a list of English auxiliary verbs, i.e. helping verbs, which include Modal verbs and Semi-modal verbs.
The English modal auxiliary verbs are a subset of the English auxiliary verbs used mostly to express modality, properties such as possibility and obligation. [a] They can most easily be distinguished from other verbs by their defectiveness (they do not have participles or plain forms [b]) and by their lack of the ending ‑(e)s for the third-person singular.
Being a very commonly used verb, it is likely that the copula has irregular inflected forms; in English, the verb be has a number of highly irregular forms and has more different inflected forms than any other English verb (am, is, are, was, were, etc.; see English verbs for details). Other copulas show more resemblances to pronouns.
As in English, modality can be indicated either lexically, with main verbs such as yào "want" followed by another main verb, or with auxiliary verbs. In Mandarin the auxiliary verbs have six properties that distinguish them from main verbs: [8]: pp.173–174 They must co-occur with a verb (or an understood verb).
English word order has moved from the Germanic verb-second (V2) word order to being almost exclusively subject–verb–object (SVO). The combination of SVO order and use of auxiliary verbs often creates clusters of two or more verbs at the center of the sentence, such as he had hoped to try to open it .
All of these verbs function as auxiliaries, representing either simple futurity, or necessity or obligation. The verb will derives from Old English willan, meaning to want or wish. Cognates include Old Norse vilja, German wollen (ich/er/sie will, meaning I/he/she want/s to), Dutch willen, Gothic wiljan.