a/an: when we mention sth for the first time, with singular nouns only, adjective+ noun combination, e,g, _____reliable partner, names of professions (__doctor,___ manager)), the: when we mention sth for the second time, with singular and plural nouns, when sth is unique (___ Moon, ___ Earth etc), names of the countries with states, federations, republic, islands etc. , superlatives (___ best, ___ most beautiful)), ordinal numbers (__first,____second), with adjectives to talk about a group of people in general (__ rich = all rich people)), no article: with groups in general (Dogs are smarter than cats), with people's names (Kevin, Sue etc), with single names of countries (Ukraine, Uganda, France etc), by+ means of transport (by__car), names of companies (___ Google), at__home, at__work, in __hospital/ prison/ court,

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