Russian Genitive Case Endings

There are exceptions of course, but these are the basic rules of thumb. Genitive use: origins, possessions; of, from, 's, none of something.

masculine nouns ending in hard consonant; neuter nouns ending in -o

-а

masculine nouns ending in -й, -ь; neuter nouns ending in -е, -ие

-я

feminine nouns ending in -я, -ь

-и

feminine nouns ending in -а

-ы

masculine plural nouns ending in a consonant

-ов

masculine plural nouns ending in -й

-ев

feminine plural nouns ending in -ь; masculine nouns ending in -ь, -ж, -ч, -ш or -щ

-ей

neuter plural nouns ending in -е

-й

neuter nouns ending in -о; feminine and masculine nouns ending in -а -я

lose their endings in the plural

one-syllable masculine nouns

-ёв; some get -ьев like лист or брат