a/an: to say what sth is: it's ... car, to speak about sth for the first time, means ONE, used with singular, not specific nouns, the: used with singular or plural, specific nouns, when we know what the person is talking about, when it's clear what the person is talking about, with ___ UK, ____ USA, _____ Russian Federation, with all water except lakes, with all deserts and mountain ranges , unique, no article: speaking in general, for plural things that aren't specific, continents, most countries, cities, streets, parks, squares, airports, languages, nationalities,

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