Почему артикли так употребляются?
This is the only way to do it
He is an only child in the family

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The use of articles is a language convention that helps to specify and clarify the noun or noun phrase being referred to in a sentence. In the first sentence, the use of "the" specifies that there is only one way to do something. In the second sentence, the use of "an" before "only child" specifies that he is one of a kind in the family, emphasizing his unique position as the only child. Overall, articles help to provide context and specificity in language use.