Noun Irregularities
1. The Genitive II.There is a small group of nouns, mostly referring to food, which uses the suffix -y for the Genitive Singular. Not all nouns referring to food take this Genitive II ending, so you will have to memorize those that do.
The Genitive II (-y)
Nom. Singular
Genitive
Gloss
сахар
сахар-у
sugar
рис
рис-у
rice
табак
табак-у
tobacco
сыр
сыр-у
cheese
чай
ча-ю
tea
шоколад
шоколад-у
chocolate
2. The Prepositional II. The second Prepositional case is marked by an (always) accented ending -y. However, this ending is not used with all the prepositions requiring the Prepositional case but only with the prepositions на and в. It is not used with the preposition o or any other preposition governing the Prepositional case. So one would say “я видел его в саду” (I saw him in the garden) but “мы говорили о саде” (we talked about the garden).
Prepositional II (accented -y)
Nom. Singular
Prep II
Gloss
пол
на полу
on the floor
сад
в саду
in the garden
лес
в лесу
in the woods
угол
на/в углу
on/in the corner
мост
на мосту
on the bridge
Дон
на Дону
on the Don
Крым
в Крыму
in the Crimea
край
на краю
on the edge
ряд
на ряду
in a line
год
в прошлом году
last year
порт
в порту
in port