Russian declension

In Russian grammar, the system of declension is elaborate and complex. Nouns, pronouns, adjectives, demonstratives, most numerals and other particles are declined for two grammatical numbers (singular and plural) and six grammatical cases ; some of these parts of speech in the singular are also declined by three grammatical genders (masculine, feminine and neuter). This gives many spelling combinations for most of the words, which is needed for grammatical agreement within and (often) outside the proposition. Also, there are several paradigms for each declension with numerous irregular forms.

Russian has retained more declensions than many other modern Indo-European languages (English, for example, has almost no declensions remaining in the language).

Nominal declension comprises six cases – nominative, accusative, genitive, prepositional, dative, instrumental, two numbers (singular and plural), and three grammatical genders (masculine, feminine, and neuter). Up to ten additional cases are identified in linguistics textbooks, although all of them are either incomplete (do not apply to all nouns) or degenerate (appear identical to one of the six simple cases). The most recognized additional cases are locative (в лесу́, на мосту́, в крови́ — in the forest, on the bridge, in (the) blood), partitive (ча́ю, са́хару, коньяку́ — (some) tea, sugar, cognac), and several forms of vocative (Го́споди, Бо́же, о́тче — (O) Lord, God, father). The adjectives, pronouns, and the first two cardinal numbers further vary by gender. Old Russian also had a third number, the dual, but it has been lost except for its use in the nominative and accusative cases with the numbers two, three and four (e.g. два стула [dvɐ ˈstulə], "two chairs", now reanalyzed as genitive singular).

Russian noun cases often replace the usage of prepositions in other Indo-European languages. Their usage can be summarised as:

There are no articles, neither definite nor indefinite (such as the, a, an in English), in the Russian language. The sense of a noun is determined from the context in which it appears. That said, there are some means of expressing whether a noun is definite or indefinite. They are:

The category of animacy is relevant in Russian nominal and adjectival declension. Specifically, the accusative has two possible forms in many paradigms, depending on the animacy of the referent. For animate referents (sentient species, professions and occupations, human-like toys, most animals), the accusative form is generally identical to the genitive form (genitive-accusative syncretism). For inanimate referents (simple lifeforms, objects, states, notions), the accusative form is identical to the nominative form (nominative-accusative syncretism). This principle is relevant for masculine singular nouns of the second declension (see below) and adjectives, and for all plural paradigms (with no gender distinction). In the tables below, this behavior is indicated by the abbreviation N or G in the row corresponding to the accusative case.

In Russian there are three declensions:

There is also a group of several irregular "different-declension nouns" (Russian: разносклоня́емые существи́тельные), consisting of a few neuter nouns ending in -мя (e.g. вре́мя "time") and one masculine noun путь "way". However, these nouns and their forms have sufficient similarity with feminine third declension nouns that some scholars such as Litnevskaya consider them to be non-feminine forms of this declension, as written in the tables below.