Second-Declension Nouns in All Cases
The second declension is the largest of the three: it gathers two genders that share one ending-set — masculine nouns ending in a consonant or -ь/-й (стол "table," слова́рь "dictionary," музе́й "museum") and all neuter nouns in -о/-е (окно́ "window," мо́ре "sea," зда́ние "building"). This page is noun-class-centric: rather than slicing one case across many words (see the master endings table), we take one model of each kind and run it through all six cases, singular and plural. The bulk of the second declension is regular and learnable by analogy — the real work, where careful learners pull ahead, is concentrated in one column: the genitive plural. That, the animacy split in the accusative, and a couple of neuter traps are what this page drills.
Model 1 — стол (hard masculine, inanimate)
The hard-stem masculine in a bare consonant is the second declension's prototype.
| Case | Singular | Plural |
|---|---|---|
| Nom. | стол | столы́ |
| Gen. | стола́ | столо́в |
| Dat. | столу́ | стола́м |
| Acc. | стол (= Nom.) | столы́ (= Nom.) |
| Instr. | столо́м | стола́ми |
| Prep. | (о) столе́ | (о) стола́х |
стол is inanimate, so its accusative copies the nominative in both numbers (стол, столы́). The genitive plural takes -ов (столо́в) — the default masculine pattern that adds a syllable, the mirror image of the feminine/neuter zero ending.
Поста́вь ча́шку на стол, пожа́луйста.
Put the cup on the table, please. — accusative стол = nominative (inanimate, motion via на).
В за́ле не хвата́ло столо́в и сту́льев.
There weren't enough tables and chairs in the hall. — genitive plural столо́в (-ов), сту́льев (-ев).
Model 2 — слова́рь (soft masculine in -ь)
Soft masculines end in -ь and take the soft-series endings: -я/-ю/-ём/-е in the singular, and crucially -ей in the genitive plural.
| Case | Singular | Plural |
|---|---|---|
| Nom. | слова́рь | словари́ |
| Gen. | словаря́ | словаре́й |
| Dat. | словарю́ | словаря́м |
| Acc. | слова́рь (= Nom.) | словари́ (= Nom.) |
| Instr. | словарём | словаря́ми |
| Prep. | (о) словаре́ | (о) словаря́х |
The genitive plural словаре́й (-ей) is the soft-masculine signature, shared by hushing-stem masculines: нож → ноже́й ("knives"), врач → враче́й ("doctors"). So masculines split their genitive plural into -ов (hard) vs -ей (soft/hushing) — that fork is the single most useful thing to learn here.
Я ищу́ хоро́ший слова́рь синони́мов.
I'm looking for a good thesaurus. — accusative слова́рь = nominative (inanimate).
На по́лке не оста́лось ни словаре́й, ни энциклопе́дий.
There were neither dictionaries nor encyclopaedias left on the shelf. — genitive plural словаре́й (-ей).
Model 3 — музе́й (masculine in -й)
Masculines in -й take -я/-ю/-ем/-е in the singular and -ев in the genitive plural (after the stem-final soft -и-/-й-).
| Case | Singular | Plural |
|---|---|---|
| Nom. | музе́й | музе́и |
| Gen. | музе́я | музе́ев |
| Dat. | музе́ю | музе́ям |
| Acc. | музе́й (= Nom.) | музе́и (= Nom.) |
| Instr. | музе́ем | музе́ями |
| Prep. | (о) музе́е | (о) музе́ях |
So the masculine genitive plural has three forms: -ов (стол → столо́в), -ев (музе́й → музе́ев), -ей (слова́рь → словаре́й). Same idea — masculines add a syllable — but the consonant before it decides which one.
В Санкт-Петербу́рге так мно́го музе́ев, что за неде́лю не успе́ешь.
There are so many museums in St Petersburg you won't manage them in a week. — genitive plural музе́ев (-ев).
Animacy: when the accusative copies the genitive
For animate masculines (people, animals), the accusative does not copy the nominative — it copies the genitive, in both singular and plural. This is the animacy override (full treatment: the animacy rule). Compare the inanimate стол with the animate студе́нт:
| Case | студе́нт (animate, sg) | студе́нт (pl) |
|---|---|---|
| Nom. | студе́нт | студе́нты |
| Gen. | студе́нта | студе́нтов |
| Acc. | студе́нта (= Gen.) | студе́нтов (= Gen.) |
Я ви́жу стол.
I see a table. — inanimate accusative стол = nominative.
Я ви́жу студе́нта.
I see a student. — animate accusative студе́нта = genitive.
Model 4 — окно́ (hard neuter)
Neuters in -о decline like hard masculines in the oblique cases, but the nominative/accusative singular keeps -о, and the genitive plural is a zero ending — bare stem, usually with a fleeting vowel.
| Case | Singular | Plural |
|---|---|---|
| Nom. | окно́ | о́кна |
| Gen. | окна́ | о́кон |
| Dat. | окну́ | о́кнам |
| Acc. | окно́ (= Nom.) | о́кна (= Nom.) |
| Instr. | окно́м | о́кнами |
| Prep. | (об) окне́ | (об) о́кнах |
окно́ → о́кон in the genitive plural: zero ending, with a fleeting -о- splitting the кн cluster, and the stress shifts back. Note also the stress flip across the number boundary: stressed ending in the singular (окно́, окна́), stressed stem in the plural (о́кна, о́кон). The same fleeting-vowel mechanism gives письмо́ → пи́сем ("letters"). (Mechanism: fleeting vowels.)
Откро́й окно́, здесь о́чень ду́шно.
Open the window, it's very stuffy in here. — accusative окно́ = nominative (inanimate neuter).
В э́той ко́мнате нет о́кон, то́лько две́ри.
This room has no windows, only doors. — genitive plural о́кон, zero ending with fleeting -о-.
Model 5 — мо́ре (soft neuter)
Soft neuters in -е take the soft-series vowels and a genitive plural in -ей.
| Case | Singular | Plural |
|---|---|---|
| Nom. | мо́ре | моря́ |
| Gen. | мо́ря | море́й |
| Dat. | мо́рю | моря́м |
| Acc. | мо́ре (= Nom.) | моря́ (= Nom.) |
| Instr. | мо́рем | моря́ми |
| Prep. | (о) мо́ре | (о) моря́х |
Ле́том мы ка́ждый год е́здим на мо́ре.
Every year in summer we go to the sea. — accusative мо́ре = nominative; на + acc for motion.
Росси́ю омыва́ют во́ды трёх океа́нов и двена́дцати море́й.
Russia is washed by the waters of three oceans and twelve seas. — genitive plural море́й (-ей).
Model 6 — зда́ние (the -ие neuter trap)
Neuters in -ие behave like мо́ре except in the prepositional singular, where they take -ии rather than -е: в зда́нии, not в здани́е. This is the exact mirror of the feminine -ия rule (Росси́я → о Росси́и) — so зда́ние and собы́тие ("event") pattern after the same logic. The genitive plural is *-ий (зда́ний).
| Case | Singular | Plural |
|---|---|---|
| Nom. | зда́ние | зда́ния |
| Gen. | зда́ния | зда́ний |
| Dat. | зда́нию | зда́ниям |
| Acc. | зда́ние (= Nom.) | зда́ния (= Nom.) |
| Instr. | зда́нием | зда́ниями |
| Prep. | (о / в) зда́нии | (о) зда́ниях |
Наш о́фис нахо́дится в ста́ром зда́нии в це́нтре.
Our office is in an old building in the centre. — prepositional зда́нии (-ии, not *зда́нь-е).
В э́том кварта́ле мно́го истори́ческих зда́ний.
There are many historic buildings in this block. — genitive plural зда́ний (-ий).
The second locative: в лесу́, на берегу́
A handful of hard masculines have an extra trick: after в or на in a locational sense, they take a stressed -у́ instead of the regular prepositional -е. This "second locative" survives in a closed set of common words — в лесу́ ("in the forest"), в саду́ ("in the garden"), на берегу́ ("on the shore"), в углу́ ("in the corner"), на полу́ ("on the floor"), в шкафу́ ("in the cupboard"). The ordinary prepositional -е stays for non-locational uses (о ле́се "about the forest"). Full list and logic: the second locative.
Мы заблуди́лись в лесу́ и верну́лись то́лько к ве́черу.
We got lost in the forest and only came back by evening. — second locative в лесу́ (not *в ле́се for location).
Common Mistakes
❌ Я ви́жу студе́нт.
Incorrect — студе́нт is animate, so the accusative copies the genitive: студе́нта.
✅ Я ви́жу студе́нта в библиоте́ке.
I see a student in the library. — animate accusative студе́нта = genitive.
❌ мно́го о́кнов / мно́го пи́сьмов
Incorrect — neuter -о nouns take a ZERO genitive plural, not -ов: о́кон, пи́сем.
✅ мно́го о́кон, мно́го пи́сем
many windows, many letters. — zero ending with a fleeting vowel.
❌ Я рабо́таю в большо́м зда́нье.
Incorrect — -ие neuters take -ии in the prepositional: в зда́нии.
✅ Я рабо́таю в большо́м зда́нии.
I work in a big building. — prepositional зда́нии (-ии).
❌ В го́роде мно́го музе́йев.
Incorrect — masculines in -й take -ев in the genitive plural, not *-йев: музе́ев.
✅ В го́роде мно́го музе́ев.
There are many museums in the city. — genitive plural музе́ев (-ев).
❌ Де́ти игра́ют в ле́се.
Not wrong grammatically, but for location these words take the second locative -у́: в лесу́.
✅ Де́ти игра́ют в лесу́.
The children are playing in the forest. — second locative в лесу́.
Key Takeaways
- The second declension = masculine consonant/-ь/-й nouns (стол, слова́рь, музе́й) + all neuters in -о/-е (окно́, мо́ре, зда́ние) — one shared ending-set.
- Animacy governs the accusative: inanimate copies the nominative (ви́жу стол), animate copies the genitive (ви́жу студе́нта).
- The genitive plural is the hard column. Masculine: -ов (столо́в), -ев (музе́ев), -ей (словаре́й). Neuter: zero (о́кон, with a fleeting vowel), -ей (море́й), -ий (зда́ний).
- -ие neuters take -ии in the prepositional singular (в зда́нии) — the mirror of the feminine -ия rule.
- A closed set of masculines has a second locative in stressed -у́ after в/на for location: в лесу́, на берегу́, в углу́.
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