a/an (indefinite article), one of a class of things, 1st mention, countable, the (definite article), the only one (in a place), it's clear which one we're talking about (often the 2nd mention), with superlative forms, with rivers, oceans, seas , mountain ranges, valleys, plural country names, groups of islands, deserts, with names of theatres, cinemas, hotels, galleries and museums, no article, to generalize something (with plural or uncountable nouns, including abstract nouns), with most country names, continents, states, lakes, mountains, towns/cities, neighbourhoods and streets, phrases with indirect meaning (go to prison, go to bed, etc.).

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