Compare each case across both numbers. The forms below are the noun's stored reference paradigm.
Singular and plural case forms for река
Case
Singular
Plural
Nominative
река
реки
Accusative
реку
реки
Genitive
реки
рек
Dative
реке
рекам
Instrumental
рекойLong instrumental variant:рекоюAccepted in practice
реками
Prepositional
реке
реках
Form pattern
How the forms are built
The paradigm above is authoritative. These notes expose a transparent ending change only when the stored declension family supports one.
Genitive · Singularрек- + -и → реки
Remove -а and add -и.
Show all case-build notes
Nominative · Singularрека
This is the dictionary form used to identify the noun.Nominative · Pluralрек- + -и → реки
Remove -а and add -и.Accusative · Singularрек- + -у → реку
Remove -а and add -у.Accusative · Pluralрек- + -и → реки
Remove -а and add -и.Genitive · Singularрек- + -и → реки
Remove -а and add -и.Genitive · Pluralрек- + zero ending → рек
Remove -а; this form has a zero ending.Dative · Singularрек- + -е → реке
Remove -а and add -е.Dative · Pluralрек- + -ам → рекам
Remove -а and add -ам.Instrumental · Singularрек- + -ой → рекой
Remove -а and add -ой.Instrumental · Pluralрек- + -ами → реками
Remove -а and add -ами.Prepositional · Singularрек- + -е → реке
Remove -а and add -е.Prepositional · Pluralрек- + -ах → реках
Remove -а and add -ах.