A/AN: when you introduce a countable noun for the first time , for someone´s occupation, with hours, days, weeks, years and decades, THE: with nouns that have been mentioned before, when there is only one in a system, with plural countries and abbreviations of countries names, with nationalities and groups of people, with mountain ranges, rivers, and oceans/seas, with instruments, ZERO: with names of cities, countries, states and roads, with nouns in general, with geographical areas, lakes, mountains, and islands, with days, months, and years, with company names,

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