A/AN: First mention of a thing/person, What sth is or what sb does, Expressions of frequency, In exclamations with What...!, THE: sth already been mentioned, clear reference, there's only one of sth, places in a town/city, etc, superlatives, NO ARTICLE: plural uncountable nouns - Generally speaking, before meals, days and months, before next, last, home, work, school, church - after at / to / from,

Articles: an/a, the, zero article - Revision of theory

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