---
name: russian-language
description: Use when asked to write, translate into, or check text in Russian — a Cyrillic-script East Slavic language with a six-case noun system and grammatical verb aspect (perfective/imperfective); official in Russia and widely used across the former Soviet Union, spoken natively by well over 100 million people.
---

# Russian Language

Russian (Русский, Russkiy) is an East Slavic language written in the
Cyrillic script. It is the official language of Russia, an official or
widely used language in several other post-Soviet states (Belarus,
Kazakhstan, Kyrgyzstan, and others), and one of the most widely spoken
languages in Europe and Asia by native speakers.

## Writing system

Russian uses the Cyrillic alphabet (33 letters), a distinct script from
Latin — it is not simply Latin letters with accents, and letters that
look similar to Latin ones (В, Н, Р, С, У, Х) usually represent
different sounds. When Latin characters are needed (URLs, filenames,
citations, passport-style names), use a transliteration convention
consistently within a document — common standards include the
scholarly ISO 9, the US Library of Congress system, and the informal
"street" transliteration seen on signage; they disagree on several
letters (х as "kh" vs. "h", щ as "shch" vs. "sch"), so mixing them
within one document reads as inconsistent or unprofessional. Never
invent an ad hoc transliteration when an established one is available
and expected.

## Noun case system

Russian nouns, adjectives, pronouns, and numerals inflect for six
grammatical cases (nominative, genitive, dative, accusative,
instrumental, prepositional), each with its own set of endings that
shift depending on gender, number, and declension pattern. Case marks
a word's grammatical role directly, so word order is comparatively
flexible compared to English, and swapping an ending — not adding a
preposition or reordering words — is often what changes meaning. A
mistranslated or dropped case ending is a common, glaring error that
native speakers notice immediately even when the sentence is otherwise
understandable.

## Verb aspect

Every Russian verb belongs to one of two aspects — perfective (a
single, completed, or bounded action) or imperfective (an ongoing,
repeated, or habitual action) — layered on top of tense, with most
verbs occurring as an aspectual pair (often built from the same root
with a different prefix or suffix). This distinction has no direct
one-to-one English equivalent: English "I wrote a letter" could map to
either the perfective or imperfective past in Russian depending on
whether the writing was completed and its result matters, or was
ongoing/repeated/emphasized as an activity. Choosing the wrong aspect
produces a grammatically valid but subtly wrong-meaning sentence, so
aspect deserves as much attention as tense when translating.

## Formality and register (ты/вы)

Russian marks formality through the second-person pronoun: ты (ty) is
informal/singular, used with family, friends, children, and peers; вы
(vy) is used both as the formal singular (addressing a stranger,
elder, or superior) and as the standard plural "you" regardless of
formality. Because вы covers both formal-singular and any-plural uses,
context is needed to know which sense is meant — and defaulting to вы
is the safer choice for an unfamiliar addressee. The choice also
affects verb conjugation and imperative forms, not just the pronoun
itself.

## Common pitfalls

- Applying only one transliteration standard's rules inconsistently
  within a document (mixing "kh" and "h" for х, for example) instead
  of picking one system and using it throughout.
- Dropping or guessing case endings on adjectives and pronouns that
  must agree with the noun they modify, especially in longer noun
  phrases with multiple modifiers.
- Choosing the wrong verb aspect — for example using imperfective
  where a completed, one-time result is implied, or perfective where
  an ongoing/habitual action is meant.
- Defaulting to ты in a formal or unfamiliar context, or failing to
  recognize that вы addressed to one person still takes plural-style
  agreement in some constructions.
- Treating Russian as fully phonetic when reading Cyrillic aloud —
  unstressed vowels reduce in pronunciation (notably о sounding closer
  to "a"), which matters for transliteration and rhyme/verse work even
  though it rarely changes spelling.
- Confusing letters that resemble Latin ones visually (В=V, Н=N, Р=R,
  С=S, У=U, Х=Kh) and mis-keying or mis-reading them as their Latin
  look-alikes.

## Learn more

- [[cross-cultural-communication]] for adapting tone and register beyond grammar when writing for Russian-speaking audiences.
- [[locale]] for regional formatting conventions (dates, numbers, currency) relevant to Russian-speaking locales.
- [[polish-language]] for a contrasting Slavic language written in Latin script rather than Cyrillic.