a/an: when we mention sth for the first time, with singular nouns only, in measurements or frequency expressions (5 days ___ week)), before someone's job, after "It's___, there's___, I have___, It's such___", the: when the listener or reader knows what we are talking about., when sth is unique (sun, moon, CEO), with superlative adjectives, with some countries (e.g. with Republic, Kingdom, States), with groups of people and nationalities (___rich, ___ French), with ordinal numbers (___first, __37th), with oceans, rivers, canals, with a groups of mountains and islands, no article: with single names of countries (Ukraine, Uganda, France etc), with plural nouns in a general way, with uncountable nouns in a general way, with single mountains, lakes, islands, with "breakfast", "lunch", "dinner", with serious diseases ("cancer"), with names of streets,

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