A/An: For singular nouns., Used the first time something is mentioned., For jobs., The: Used the second time something is mentioned., For specific plural nouns, For things which are unique (only one), For groups of countries, states or islands., With rivers, ranges of mountains, deserts, lakes and oceans., No Article: For plurals in general., For names, countries, cities and streets., With days, time and in some collocations.,

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