Grammar Overview

In a nutshell

Russian uses word endings (cases) to show grammatical roles that English shows with word order and prepositions.
There are 6 cases. Each answers a specific question ("who did it?", "whom did you see?", "whose is it?"...).
The 13 grammar lessons build in a specific order — cases first, then verbs, then the pieces that combine everything.
Study each lesson twice: once for the idea, once for the endings tables. Then drill.

Why cases matter

In English, word order carries meaning. "The dog bites the man" and "The man bites the dog" are different sentences purely because of word order — swap the words and the meaning flips.

Russian doesn't work that way. Word order is flexible; the endings on nouns, pronouns, and adjectives tell you who's doing what to whom. Take a simple sentence:

Я вижу соба́ку. — lit. "I see dog-ACC." — "I see a dog."

That -у on «соба́ка» (dog) isn't decoration — it marks «соба́ку» as the thing being seen, the direct object. You could scramble the word order — «Соба́ку я вижу» — and the sentence would still mean "I see the dog," just with a different emphasis, because the -у still marks the dog as the object no matter where it sits in the sentence.

This is the single biggest mental shift coming from English or from Duolingo-style phrase memorization: you're not just learning words, you're learning to change the end of almost every word depending on its job in the sentence. That system of endings-by-job is called case. Russian has six of them.

Once cases click, you stop memorizing whole sentences and start building them — which is the actual goal of this site.

The 6 cases at a glance

Every noun, pronoun, and adjective changes its ending depending on which case the sentence calls for. Here's the full set, each with its one-line job and a live example. Don't try to memorize the endings from this table — that's what each dedicated lesson is for. Just get oriented.

Case	Job	Example
Nominative	The dictionary form; the subject — who or what is doing the action	Э́то кни́га. — lit. "This book-NOM." — "This is a book."
Accusative	The direct object — who or what receives the action; also direction ("to where")	Я чита́ю кни́гу. — lit. "I read book-ACC." — "I'm reading a book."
Genitive	Possession ("of"), absence, quantities, and a long list of prepositions (из, от, для...)	У меня́ нет кни́ги. — lit. "At me not-exist book-GEN." — "I don't have a book."
Dative	The indirect object — to/for whom; also age, necessity, and impersonal feelings	Я даю́ кни́гу дру́гу. — lit. "I give book-ACC friend-DAT." — "I'm giving the book to a friend."
Instrumental	The means or tool ("by/with"), and roles after "to be"	Я пишу́ ру́чкой. — lit. "I write pen-INSTR." — "I'm writing with a pen."
Prepositional	Location ("in/at") and the topic of "about"; only ever used after a preposition	Кни́га в су́мке. — lit. "Book in bag-PREP." — "The book is in the bag."

Nominative is the "default" — it's what you find in a dictionary, and it needs no lesson of its own because it's the form you already half-know from vocabulary. The other five each get a full lesson.

How the 13 lessons build on each other

The lessons are ordered so each one leans on the last. Don't skip ahead — later lessons assume you already have the earlier machinery.

Gender & Nouns — the foundation. Every case ending depends on a noun's gender and whether it's singular or plural, so this comes first.
Accusative — the first case, and the simplest: direct objects and "where to."
Prepositional — location: "where." Grouped early because it's high-frequency and low-complexity.
Genitive — the workhorse case. Possession, negation, quantities, numbers, and half of all common prepositions run through genitive. Gets the most depth of any lesson.
Dative — indirect objects, age, and the "мне нра́вится" pattern you'll use constantly.
Instrumental — "with/by means of," professions, and time expressions like «ле́том».
Verbs — Present Tense — now that cases can build objects, you need verbs to act on them.
Verbs — Past & Future — extending the verb system across time.
Verbal Aspect — the hardest single topic in Russian: perfective vs. imperfective. Needs solid present/past/future first.
Adjectives & Possessives — adjectives inherit case from the nouns they describe, so this needs all six cases already in place.
Pronouns — pronouns decline through all six cases too, and lean on everything above.
Numbers & Time — numbers trigger genitive in specific, quirky ways (see Genitive §Quantities); this lesson assumes genitive is solid.
Verbs of Motion (Intro) — combines verbs, aspect, and the accusative/prepositional "where"/"where to" distinction into one notoriously tricky system.

Cases (1–6) form one block, verbs (7–9) form the next, and 10–13 are "integration" lessons that only make sense once both blocks are in place.

How to study a lesson

Read once, fast. Get the shape of the idea — what's this case for? Don't stop to memorize tables yet.
Read again, slow. This time sit with the ending tables. Say the example sentences out loud — hearing «кни́гу» versus «кни́га» matters more than seeing it.
Cover and recall. Look at a bare noun (nominative) and try to produce the case ending from memory before checking the table.
Do the Practice section at the end of the lesson. Every lesson ends with 8–12 exercises and a hidden answer key (??? success "Answers") — write your answers before revealing them. The answers explain why, not just what — read those explanations even when you got it right.
Drill it again a few days later using the Case Drills page, mixed with earlier cases so you're not just pattern-matching on "whatever case I studied this week."

Next: Alphabet & Pronunciation if you haven't locked in reading fluency yet, or straight into Gender & Nouns to start the case system.