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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 verb do can be used optionally as an auxiliary even in simple ...
To form a question from a sentence which does not have such an auxiliary or copula present, the auxiliary verb do (does, did) needs to be inserted, along with inversion of the word order, to form a question (see do-support). For example: She can dance. → Can she dance? (inversion of subject she and auxiliary can)
Here the subject is Sam, and the verb has is an auxiliary. In the question, these two elements change places (invert). If the sentence does not have an auxiliary verb, this type of simple inversion is not possible. Instead, an auxiliary must be introduced into the sentence in order to allow inversion: [3] a. Sam enjoys the paper.
Questions are formed by subject–auxiliary inversion (unless the interrogative word is part of the subject). If there is otherwise no auxiliary, the verb do (does, did) is used as an auxiliary, enabling the inversion. This also applies to negation: the negating word not must follow an auxiliary, so do is used if there is no other auxiliary.
Modern grammars do not differ substantially over membership in the list of auxiliary verbs, though they have refined the concept and, following an idea first put forward by John Ross in 1969, [8] have tended to take the auxiliary verb not as subordinate to a "main verb" (a concept that pedagogical grammars perpetuate), but instead as the head of a verb phrase.
If the verb is in the present perfect, for example, the tag question uses has or have; if the verb is in a present progressive form, the tag is formed with am, are, is; if the verb is in a tense which does not normally use an auxiliary, like the present simple, the auxiliary is taken from the emphatic do form; and if the sentence has a modal ...