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.
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.
Source: Wikipedia "Do-support" · CC BY-SA 4.0
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