A/an : sth mentioned for the 1st time, when referring to "one of many", to talk about someone's job, The: sth we have mentioned before, sth unique or specific, "the only one", seas, rivers, oceans, to refer to a period in history, with ordinal numbers, with superlative forms of adjectives, mountain range, group of islands, before singular and plural countable nouns, US, UK, NL, Hague, Renaissance, worst, best, easiest, third, fifth, first, Prime Minister, ø = no article: to talk about things in general, streets, cities, countries, continents, languages, airports, stations, single mountain / island, before uncountable & plural countable nouns, primary education, Europe, Ireland, Bratislava,

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