A/AN, before job titles and illnesses , to talk about one example of something , countable noun mentioned for the first time, THE, to talk about something that both the speaker and listener knows, there is only one of something, countries with a plural element (UK) , mountain ranges, rivers, canals, seas, oceans , deserts , names of hotels, theaters, museums, NO ARTICLE (ZERO ARTICLE), countries , to talk about something in a general sense , name of mountains, names of lakes, names of streets, Parkes, squares, stations, airports , nationalities and languages .

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