Russian Cases and Noun Declension: Six Cases Explained

Russian cases show the role of a noun in a sentence. The same word changes form depending on whether it names the subject, an object, a recipient or another relationship: книга — книгу — в книге. Declension is the pattern of these changes. To choose a form, first identify the required case, then apply the noun’s declension pattern and number.

The six Russian cases at a glance

These questions help name a case once you understand the construction; they are not a complete method for choosing one. Кого? belongs to both genitive and accusative. A verb or preposition often determines the case: помогать другу uses dative, while видеть друга uses accusative. Друга matches the genitive form, but its role here is determined by the sentence. Learn the whole phrase rather than translating a question mechanically.

What each case does in a sentence

Nominative: the subject

Курьер привёз посылку — “The courier delivered a parcel”. Курьер is the subject and stays in the nominative; посылку is the object. Reversing their order does not automatically reverse their roles: Посылку привёз курьер still says the courier delivered it, now with emphasis on who did it. Russian word order has meaning even though endings identify the roles.

Genitive: possession, absence and quantity

Compare ключ соседки — “the neighbour’s key”, нет билета — “there is no ticket”, and чашка чая — “a cup of tea”. The genitive also follows prepositions such as без, для, из and у: без сахара, “without sugar”. In У сестры есть машина, сестры is genitive after у, while машина is nominative.

Dative: the recipient and the person experiencing a state

Я отправил коллеге сообщение means “I sent my colleague a message”: коллеге is the recipient. Dative also appears in Брату холодно — “My brother is cold”, and after к: к врачу — “to the doctor”. Learn verb patterns such as помогать соседу and звонить клиенту with the dative form.

Accusative: the direct object and destination

Я читаю статью — “I’m reading an article” — uses accusative for the direct object. With в and на, it can mark a destination: Мы идём в библиотеку, “We’re going to the library”. Animacy affects some accusative forms; this is explained below.

Instrumental: means, company and role

Compare писать карандашом, “to write with a pencil”, and говорить с коллегой, “to talk with a colleague”. The instrument normally needs no с; companionship does. Instrumental also follows certain verbs: Она работает переводчиком, “She works as a translator”. Do not use this ending for every noun that names a profession: Она переводчик has nominative.

Prepositional: location and topic

This case always has a preposition: в квартире, “in the apartment”, на работе, “at work”, о поездке, “about the trip”. Other cases can also follow prepositions, so the name “prepositional” does not mean “the case after every preposition”.

Three main noun declension patterns

In the traditional school classification, a noun’s gender and nominative singular form determine its main declension type. Gender alone is not enough: masculine папа follows the first pattern, while masculine стол follows the second. A final ь does not identify gender: день is masculine, тетрадь is feminine.

Singular declension table

These four inanimate model nouns show common patterns. Learn the complete forms and their stress, not just detached endings. Soft stems and special endings have variations, so this table is a foundation rather than a rule for every noun.

The instrumental feminine also has longer variants such as книгою; the table uses the common shorter form. After г, к, х, ж, ч, ш, щ, write и instead of ы in these endings: книга → книги. For words in -ия, note станция → к станции, о станции; words in -ий/-ие have prepositional -ии: о санатории, о здании.

Plural declension table

The plural dative, instrumental and prepositional commonly use -ам/-ям, -ами/-ями, -ах/-ях. The genitive plural is less predictable: compare столов, книг, окон and тетрадей. You cannot form every genitive plural by adding -ов, and the stem can change as well as the ending.

Animacy and the accusative

In the plural, animate nouns normally use an accusative matching the genitive; inanimate nouns use one matching the nominative: вижу студентов, “I see students”, but вижу столы, “I see tables”. In singular masculine nouns of the second declension, the same contrast applies: вижу студента / вижу стол.

Do not apply “animate = genitive form” to every singular noun. First-declension singular nouns have -у/-ю: вижу сестру, вижу папу; feminine тетрадь keeps its form in the accusative. Animacy is a grammatical category, not simply a test of biological life: plants are normally inanimate, as in вижу деревья.

Prepositions: where or where to?

With spatial в/на, a destination usually takes accusative and a location takes prepositional: иду в школу / учусь в школе. Do not simplify this to “movement always needs accusative”: гуляю в парке describes movement within a location and uses prepositional. The particular preposition and meaning matter.

A single preposition can take different cases: с другом means “with a friend” and uses instrumental; со стола means “off/from the table” and uses genitive. Learn prepositions together with a meaning and case, not as isolated translations.

Exceptions and agreement: what the basic tables do not cover

Some nouns do not change their visible form: новое метро — около метро — в метро. They still have a case in the sentence. Others have special patterns, such as время — времени or мать — матери. A few location forms differ from the usual prepositional: о лесе but в лесу. Learn these as additional forms, not as endings to apply to every noun.

Adjectives and many pronouns agree with the noun, but use their own endings: новая книга → нет новой книги → с новой книгой. Do not copy the noun’s ending onto the adjective. For each phrase, choose the case first, then change every word that must agree with the noun.