Indefinite article (a/an): One of many, Not specific object , Singular nouns mentioned for the first time, With jobs , Before an adjective + singular noun., Definite article (the): Unique things, Specific object (you know exactly which one), When something was mentioned before., With names of seas, oceans, rivers, canals., With country names that are plural or use words like Kingdom, Republic, and Federation., With superlative adjectives., With ordinal numbers (1st, 2d...), With groups of islands, mountains., In some phrases with prepositions (in...morning, at...end etc),

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