a/an: non specific, with a noun when it is first mentioned, the: the noun is mentioned later, both the writer and the reader know the specific person, place, or thing(s) being referred to   , particular group of people, because there is only one, with a superlative adjective, -: with plural nouns, n, before abstract nouns, Proper nouns, Non-count nouns,

b2 - u2- articles

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