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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 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 verb do has a similar vowel shortening in does and done; see below.) Verbs irregular only in spelling: lay–laid, pay–paid (although in the meaning "let out", of a rope etc., pay may have the regular spelling payed). For weak verbs that have adopted strong-type past tense or past participle forms, see the section above on strong verbs.
how did / how would howdy (informal) how do you do / how do you fare how’ll: how will / how shall how’re: how are how’s: how has / how is / how does I’d: I had / I would I’d’ve: I would have / I did have I’d’nt: I would not / I did not I’d’nt’ve (informal) I would not have / I did not have If’n (informal) If and when I’ll
For details of the use of do, did and does for this and similar purposes, see do-support. For exceptions to the principle that the inverted verb must be an auxiliary, see § Inversion with other types of verb below. It is also possible for the subject to invert with a negative contraction (can't, isn't, etc.). For example: a. He isn't nice. b.
English grammar is the set of structural rules of the English language. This includes the structure of words, ... It also includes the auxiliary do (does, did); ...
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