Genitive Case. Singular nouns
- Masculine and neuter nouns that end in a hard stem have the
ending -a in the genitive singular:
| nominative | genitive |
| брат | брата |
| автобус | автобуса |
| Антон | Антона |
| окно | окна |
| письмо | письма |
- Masculine and neuter nouns that end in a soft consonant have
the ending -я in the genitive singular:
| nominative | genitive |
| трамвай | трамвая |
| Юрий | Юрия |
| учитель | учителя |
| море | моря |
- Feminine nous that end in a hard stem have the ending -ы in the
genitive singular:
| nominative | genitive |
| сестра | сестры |
| Нина | Нины |
- Feminine nouns that end in a soft consonant have the ending -и in
the genitive singular:
| nominative | genitive |
| Аня | Ани |
| Мария | Марии |
| неделя | недели |
| мать | матери |
| дочь | дочери |
- Feminine nouns that have a stem ending in the letters к, г, х, ч, ж, ш, щ,
have the ending -и in the genitive singular (because of the spelling rule problem):
| nominative | genitive |
| книга | книги |
| копейка | копейки |