Compare each case across both numbers. The forms below are the noun's stored reference paradigm.
Singular and plural case forms for фирма
Case
Singular
Plural
Nominative
фирма
фирмы
Accusative
фирму
фирмы
Genitive
фирмы
фирм
Dative
фирме
фирмам
Instrumental
фирмойLong instrumental variant:фирмоюAccepted in practice
фирмами
Prepositional
фирме
фирмах
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 · Singularфирм- + -ы → фирмы
Remove -а and add -ы.
Show all case-build notes
Nominative · Singularфирма
This is the dictionary form used to identify the noun.Nominative · Pluralфирм- + -ы → фирмы
Remove -а and add -ы.Accusative · Singularфирм- + -у → фирму
Remove -а and add -у.Accusative · Pluralфирм- + -ы → фирмы
Remove -а and add -ы.Genitive · Singularфирм- + -ы → фирмы
Remove -а and add -ы.Genitive · Pluralфирм- + zero ending → фирм
Remove -а; this form has a zero ending.Dative · Singularфирм- + -е → фирме
Remove -а and add -е.Dative · Pluralфирм- + -ам → фирмам
Remove -а and add -ам.Instrumental · Singularфирм- + -ой → фирмой
Remove -а and add -ой.Instrumental · Pluralфирм- + -ами → фирмами
Remove -а and add -ами.Prepositional · Singularфирм- + -е → фирме
Remove -а and add -е.Prepositional · Pluralфирм- + -ах → фирмах
Remove -а and add -ах.