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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, ...
A verb together with its dependents, excluding its subject, may be identified as a verb phrase (although this concept is not acknowledged in all theories of grammar [23]). A verb phrase headed by a finite verb may also be called a predicate. The dependents may be objects, complements, and modifiers (adverbs or adverbial phrases).
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.
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).
Auxiliary verbs form main clauses, and the main verbs function as heads of a subordinate clause of the auxiliary verb. For example, in the sentence the dog did not find its bone , the clause find its bone is the complement of the negated verb did not .
Contrary to the subject-auxiliary inversion, the verb in cases of subject–verb inversion in English is not required to be an auxiliary verb; it is, rather, a full verb or a form of the copula be. If the sentence has an auxiliary verb, the subject is placed after the auxiliary and the main verb. For example: a. A unicorn will come into the ...