A / an, mention something for the first time, in exclamations like “What ...!”, after the verbs to be and have/has, for one person or thing, once ... week/twice ... month, have ... good time, in ... hurry, The, mention something for the second time, when it’s clear what you’re talking about, when there’s only one of something, countries with a plural element, mountain ranges, revers, canals, seas, oceans, deserts, hotels, theatres, museums, play ... piano/guitar, in ... morning/afternoon/evening, No article, speaking in general, have ... breakfast, ... last week/... next month, with days, months, countries, cities, towns, mountains, lakes, have ... fun, listen to ... music

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