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Do-support (sometimes referred to as do-insertion or periphrastic do), in English grammar, is the use of the auxiliary verb do (or one of its inflected forms e.g. does), to form negated clauses and constructions which require subject–auxiliary inversion, such as questions.
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.
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 ...
The verbs have, do and say also have irregular third-person present tense forms (has, does /dʌz/, says /sɛz/). The verb be has the largest number of irregular forms (am, is, are in the present tense, was, were in the past tense, been for the past participle).
The alternative dove (found mainly in American usage) arose by analogy with strong verbs do (does /dʌz/) – did – done bedo (bedoes) – bedid – bedone misdo (misdoes) – misdid – misdone outdo (outdoes) – outdid – outdone overdo (overdoes) – overdid – overdone redo (redoes) – redid – redone underdo (underdoes) – underdid ...
In some dialects, it is also used for do, does, did, and will. The development of ain't for the various forms of be, have, will and do occurred independently, at different times. The use of ain't for the forms of be was established by the mid-18th century and for the forms of have by the early 19th century.
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The use of present and past tenses without reference to present and past time does not apply to all dependent clauses, however; if the future time or hypothetical reference is expressed in the dependent clause independently of the main clause, then a form with will or would in a dependent clause is possible: