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

Articles, Close up B1+

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