A/ An, before professions, to describe sth/smn with a noun or adjective+noun, when sth is mentioned for the first time, when it's not important which thing we mean, singular countable nouns, 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, deserts, mountain ranges, to talk about the whole group of people, "--", before plural/ uncountable nouns to talk about things in general, before continents, most country names, cities, before lakes, one mountain, street names, parks , before academic subjects, seasons, holidays, meals, with sports.

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