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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:
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 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.
Deontic logic is the field of philosophical logic that is concerned with obligation, permission, and related concepts.Alternatively, a deontic logic is a formal system that attempts to capture the essential logical features of these concepts.
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 ...
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 , and catenative verbs . Primary Auxiliary Verbs
Deontic moods are a category of grammatical moods that are used to express deontic modality. An example for a deontic mood is the imperative ("Come!").. However, many languages (like English) have additional ways to express deontic modality, like modal verbs ("I shall help you.") and other verbs ("I hope to come soon."), as well as adverbials (hopefully) and other constructions.