The instructor explains that Russian nouns have genders (masculine, feminine, neuter) determined by their endings. Lesson 1 focuses on the hard and fast rule: nouns ending in a consonant are masculine, ending in -а or -я are feminine, ending in -о or -е are neuter.
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If you are working through an older video series, it’s helpful to pair it with modern tools to ensure your slang and intonation are up to date: The instructor explains that Russian nouns have genders