Let's explore the grammatical function of the auxiliary verb "do" in English, like its use in forming questions and negative sentences, or its role in subject-auxiliary inversion and negation.

We'll also trace the etymological history of "do," highlighting its evolution from a main verb to an auxiliary verb and its appearance in various idioms and phrases. Then we'll discuss the origins of the "do"-support construction, proposing that its presence in modern English might stem from influences of Celtic languages.

#etymology #englishlanguage #englishvocabulary #englishgrammar

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