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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 Cambridge Grammar of the English Language (2002) describes auxiliary verbs as "a small list of verbs with very specific syntactic properties", differing from "all the rest of the verbs in the dictionary, which we will call the lexical verbs . . . in inflectional morphology as well as syntax" [9]: 74 And later: "A general definition of ...
This is a list of English auxiliary verbs, i.e. helping verbs, which include Modal verbs and Semi-modal verbs. See also auxiliary verbs, light verbs, ...
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).
Take, for instance, "She at home": the word was can be inserted to mark this sentence, making the marked equivalent "She was at home". Auxiliaries such as these also have opposing negative and affirmative forms. In its negative form the auxiliary verb "wadn" is used to convey the opposing affirmative form. [67]
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. In most sentences, English marks ...
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.
While light verbs are similar to auxiliary verbs regarding their contribution of meaning to the clauses in which they appear, light verbs fail the diagnostics that identify auxiliary verbs and are therefore distinct from auxiliaries. The intuition between the term "light verb" is that the predicate is not at its full semantic potential.