Indefinite article (a/an): one of many, not specific object, jobs and beliefs, With singular countable nouns when they are mentioned for the first time., Definite article (the): unique object, specific object, when something has been mentioned before, with names of seas, oceans, rivers, canals, with plural countries (kingdom, states, republic, etc.), with superlative adjectives, with ordinal numbers, with groups of islands, mountains, lakes, with musical instruments, Zero article: names of companies, streets, roads, avenues, single mountains, islands, lakes, with sports, with plural,

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