: For singular nouns., Used the first time something is mentioned., For jobs., When is one of a class., : 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., With superlatives, With names of museums, theatres, cinemas, hotels and galleries., : For plurals in general., For names, countries, cities and streets., With days, time and in some collocations.,

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