a/an, the first time smth is mentioned, in the meaning of 'one', singular nouns, job titles, the, with smth that has already been mentioned, when the speaker and listener know the subject matter, there is only one of smth, UK, USA, Netherlands, groud of islands, seas, oceans, rivers, superlatives, mountain rangers (___ Alps, ___ Andes, etc.), zero article, with things or people in general, plural nouns, cities and countries, people's names, lakes.

9.2 articles

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