A/ An: before professions, to describe sth/smb with a noun or adjective+noun, when sth is mentioned for the first time, when it's not important which thing we mean, before nouns when they are one of several, in phrases of quantity or frequency (once.... year), The: it's clear which thing/ things we mean, when sth has been mentioned before, when there is only one of something, with superlatives, with dates in spoken English, before seas, oceans, rivers, canals, before mountain ranges, groups of islands, , before the names of organizations, newspapers/ magazines, musical instruments and dances, with the names of families, with nationalities , with titles (__ Prince of Wales), with historical periods/ events, "--": before plural/ uncountable nouns to talk about things general, before continents, most country name, cities, before lakes, one mountain/ island, before academic subjects, seasons, holidays, meals, with sports, games, celebrations, drinks, before stations, roads, parks, squares, with proper names, with the words home, work, hospitals, school, university, with the names of illnesses , with by + means of transport, with most abstract nouns: advice, anger, beauty, confidence, courage, employment,

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