When to Use The: Practical English Rules
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The word the points to a specific, identifiable referent. Unlike indefinite articles that introduce an unspecific member of a class, the signals that both speaker and listener share an understanding of the exact noun in question. It functions with singular countable nouns, plural countable nouns, and uncountable nouns alike, provided the identity of the noun is established.
I ordered a salad and a sandwich, but the sandwich was completely cold.