No article : plural and uncountable nouns, continents, most counties and cities , before verbs, A: singular countable nouns , occupations (jobs), when something is mentioned for the first time , An: occupations (jobs) that starts with a vowel , singular countable nouns that starts with a vowel , something stars with a vowel and is mentioned for the first time , The: specific things / people , before superlative adjectives , ordinal numbers , periods, some countries ,

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