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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.
Modal verbs generally accompany the base (infinitive) form of another verb having semantic content. [1] In English, the modal verbs commonly used are can, could, may, might, must, shall, should, will, would, and ought.
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:
The past tense equivalent is That could have been Mary at the door yesterday, with a morphologically altered main verb. conditional ability: I could do that if I knew how to swim. In the past one can say I could have done that if I had known how to swim. slight intention in the present: I could do that for you (and maybe I will). There is no ...
The English modal verbs consist of the core modals can, could, may, might, must, shall, should, will, would, as well as ought (to), had better, and in some uses dare and need. [20] These do not inflect for person or number, [ 20 ] do not occur alone, and do not have infinitive or participle forms (except synonyms, as with be/being/been able (to ...
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.).
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]
Both verbs also have their own preterite (past) forms, namely should and would, which derive from the actual preterites of the Old English verbs (made using the dental suffix that forms the preterites of weak verbs). These forms have developed a range of meanings, frequently independent of those of shall and will (as described in the section on ...