Indefinite article a/an: For non-specific singular countable nouns., For jobs or professions., When we mention sb. or sth for the first time, Definite article (The): When we refer to something already mentioned., Musical instruments., unique objects., Rivers, seas and oceans, superlatives, mountain ranges, island groups, deserts, theatres, cinemas, hotels, galleries and museums, Zero article: Names, General plural and uncountable nouns., Institutions (school, hospital, prison...), Most countries, continents, provinces., towns, cities, streets, parks, bridges, shops and restaurants,

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