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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.
A modal verb can serve as the finite verb introducing a verb catena, as in he might have been injured then. These generally express some form of modality (possibility, obligation, etc.), although will and would (and sometimes shall and should ) can serve—among their other uses—to express future time reference and conditional mood, as ...
A modal verb is a type of verb that contextually indicates a modality such as a likelihood, ability, permission, request, capacity, suggestion, order, obligation, necessity, possibility or advice. Modal verbs generally accompany the base (infinitive) form of another verb having semantic content. [1]
The non-past verb forms are conjugated by person/number, while the past verb forms are conjugated by gender/number. The present tense is indicated with the non-past imperfective form. The future in the perfective aspect is expressed by applying the conjugation of the present form to the perfective version of the verb.
In linguistics, grammatical mood is a grammatical feature of verbs, used for signaling modality. [1] [2]: 181 [3] That is, it is the use of verbal inflections that allow speakers to express their attitude toward what they are saying (for example, a statement of fact, of desire, of command, etc.).
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 ...
Modal auxiliary verbs, such as the English words may, can, must, ought, will, shall, need, dare, might, could, would, and should, are often used to express modality, especially in the Germanic languages. Ability, desirability, permission, obligation, and probability can all be exemplified by the usage of auxiliary modal verbs in English:
An example is the verb have in the sentence I have finished my lunch. Here, the auxiliary have helps to express the perfect aspect along with the participle, finished. Some sentences contain a chain of two or more auxiliary verbs. Auxiliary verbs are also called helping verbs, helper verbs, or (verbal) auxiliaries. Research has been conducted ...