A/an : mentioned for the 1st time, singular nouns, jobs jobs jobs , with some expressions of quantity, with some expressions of frequency, in exclamations with  What + a countable noun, The: sth mentioned before, sth unique, seas, rivers, oceans, with superlatives, hotels, pubs, theatres, museums, newspapers, mountain range, group of islands, ø: to talk about things in general, cities, countries, lakes, magazines, streets, languages, meals, airports, stations, single mountain, single island, in exclamations with What + an uncountable noun,

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