a/an: with singular countable nouns, when mentioning something for the first time, to say what someone's profession is, to indicate one in number, the: to refer to something previously mentioned, to talk about something unique, that there is only one of , with superlative adjectives and adverbs, with 'first' and 'last', to talk about specific things or people, zero article: with plural countable nouns, when referring to a noun in a general, abstract, or nonspecific sense,

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