a/an: when we mention sth for the first time, with singular nouns only, with singular nouns that start with a consonant, with singular nouns that start with a vowel, with jobs, the: when we mention sth for the second time, with singular and plural nouns, when sth is unique (the Moon, the Earth etc), directions (on the left, on the right, at the corner), names of the countries with states etc. (the USA, the UK etc), with group of mountains, islands (the Hawai, the Alps etc), no article: with groups in general (Dogs are smarter than cats), with people's names, with single names of countries (Ukraine, Uganda, France etc), with names of lakes, single mountains and islands (Thames, Como, Everest etc), with uncountable nouns when talking in general, with languages,

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