a/an:, With singular countable nouns when it is not clear to the listener/reader which person or thing is being talked about., When something is mentioned for the first time., In phrases of quantity or frequency., the, When it is clear to the listener/reader what is being talked about., When something is unique., With superlatives., When something has been mentioned before., With oceans, rivers, organisations, deserts, mountain ranges and decades., In fixed lexical phrases., With an adjective or a singular countable noun when talking about things in general., no article, With plural and uncountable nouns when talking about things in general., With continents, countries, towns, roads, stations, mountains and lakes.

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