There is one small but relentless rule that separates fluent Russian from textbook Russian: the н- that the third-person pronouns pick up after a preposition. его́ is "him/his," but "at his place" is у него́; её is "her," but "towards her" is к ней. Skipping this н- (saying *у его́) is one of the most audible learner mistakes there is — Russians hear it instantly. The good news is that the rule is mechanical and absolute: it has no exceptions in the directions that matter, so once you internalise the trigger you will never have to think about it again.
The rule in one line
A third-person pronoun (он, она́, оно́, они́) adds an initial н- when, and only when, it directly follows a preposition.
That sentence has three load-bearing conditions, and all three must hold:
- The pronoun is third person (он/она́/оно́/они́) — first and second persons never take н-.
- There is a preposition in front of it.
- The pronoun is in an oblique case (everything but the nominative — and the nominative never follows a preposition anyway).
Bare versus prepositional forms
Here is the same pronoun in two columns: the bare form (no preposition) and the prepositional form (н- added). Memorise them as pairs.
| Case | он / оно́ — bare | он / оно́ — after prep. | она́ — bare | она́ — after prep. | они́ — bare | они́ — after prep. |
|---|---|---|---|---|---|---|
| Gen. | его́ | (у) него́ | её | (у) неё | их | (у) них |
| Dat. | ему́ | (к) нему́ | ей | (к) ней | им | (к) ним |
| Acc. | его́ | (на) него́ | её | (на) неё | их | (на) них |
| Instr. | им | (с) ним | ей | (с) ней | и́ми | (с) ни́ми |
| Prep. | — (no bare form) | (о) нём | — | (о) ней | — | (о) них |
The prepositional case has no bare column because, by definition, it only ever appears after a preposition — so it is always an н- form (нём, ней, них). The other oblique cases have both a bare and an н- form, selected purely by whether a preposition precedes. (For the complete grid of all eight personal pronouns across the cases, see the forms page.)
У него́ есть кот, а у неё — соба́ка.
He has a cat, and she has a dog. — у него́ / у неё: the preposition у triggers н-.
Я ча́сто ду́маю о нём.
I often think about him. — prepositional нём, always an н- form after о.
Мы идём к ним в го́сти ве́чером.
We're going to visit them this evening. — к ним: dative with the obligatory н-.
Where the н- comes from
The н- is a fossil. Several old Russian prepositions ended in a consonant -n: вън, кън, сън (ancestors of в, к, с). Over time that final -n detached from the preposition and re-attached to the following pronoun, then spread by analogy to all prepositions. So у-него́ is, historically, a misanalysed у-н-его́. This is why the н- carries no meaning — it is a purely phonetic, etymological leftover. Knowing this helps: there is nothing to interpret, only a trigger to react to.
The н- touches only the third person
First- and second-person pronouns (я, ты, мы, вы) never take н-, no matter what preposition precedes them. There is no нменя́, no нтобо́й. The rule is exclusively about он/она́/оно́/они́.
Он сиди́т ря́дом со мной, а не с тобо́й.
He's sitting next to me, not next to you. — со мной, с тобо́й: first/second person, NO н-.
Они́ говоря́т о нас, а не о них.
They're talking about us, not about them. — о нас (1st pl., no н-) vs о них (3rd pl., н-).
The crucial contrast: preposition or not?
The same word его́ appears in two completely different jobs, and only one of them triggers н-:
- его́ = object/genitive pronoun ("him / of him") → takes н- after a preposition: у него́, для него́.
- его́ = possessive ("his") → belongs to the noun, not to a preposition, so it never takes н-, even when a preposition is present elsewhere in the phrase.
This is the subtlety that catches everyone. In для его́ дру́га ("for his friend"), the preposition для governs дру́га, not его́ — его́ is just "his," attached to дру́га. So no н-:
Э́то пода́рок для его́ дру́га.
This is a present for his friend. — для governs дру́га; его́ ('his') is a possessive → NO н-.
Я ви́жу его́ дом из окна́.
I can see his house from the window. — его́ ('his') here, no preposition on the pronoun → no н-.
Его́ зову́т Анто́н.
His name is Anton (lit. 'they call him Anton'). — его́ is the object of the verb, no preposition → no н-.
Compare the possessive для его́ дру́га ("for his friend") with the pronominal для него́ ("for him"): same preposition для, but in the second one his governs the pronoun directly, so н- appears.
Comparative forms keep the bare его́/её/их
After a comparative (бо́льше, лу́чше, ста́рше…), Russian uses the bare genitive without a preposition — and therefore without н-: ста́рше его́ ("older than him"), not *ста́рше него́. This is a useful confirmation that the trigger is the preposition, not the meaning.
Моя́ сестра́ ста́рше его́ на два го́да.
My sister is two years older than him. — comparative, no preposition → bare его́, no н-.
Common Mistakes
❌ У его́ есть маши́на.
Missing н- — after the preposition у the genitive pronoun needs н-: у него́. (Bare его́ is the possessive 'his'.)
✅ У него́ есть маши́на.
He has a car. (у него́, prepositional н- form)
❌ Я говорю́ с им.
Missing н- — the instrumental after с needs the н- form: с ним.
✅ Я говорю́ с ним.
I'm talking with him. (с ним)
❌ Э́то кни́га для него́ сестры́.
Wrong н- — here для governs сестры́; него́ should be the possessive его́ ('his sister') with NO н-.
✅ Э́то кни́га для его́ сестры́.
This is a book for his sister. (его́ = 'his', possessive, no н-)
❌ Он сиди́т ря́дом с ней… и с нтобо́й.
The н- rule applies ONLY to он/она́/оно́/они́; second person stays bare: с тобо́й.
✅ Он сиди́т ря́дом с ней и с тобо́й.
He's sitting next to her and next to you. (с ней has н-; с тобо́й does not)
❌ Моя́ сестра́ ста́рше него́.
No preposition after a comparative, so no н-: use bare его́.
✅ Моя́ сестра́ ста́рше его́.
My sister is older than him. (comparative → bare его́)
Key Takeaways
- Third-person pronouns (он, она́, оно́, они́) add н- after a preposition: у него́, к ней, с ни́ми, о нём, для них.
- The trigger is the preposition governing that pronoun — nothing else. No preposition, no н- (его́ зову́т, ви́жу его́).
- The rule never touches first/second person: с тобо́й, со мной, о нас — never *с нтобо́й.
- The possessive его́/её/их ("his/her/their") never takes н-, even with a preposition nearby, because it belongs to the noun: для его́ дру́га ("for his friend") vs для него́ ("for him").
- Comparatives use the bare genitive with no preposition, hence no н-: ста́рше его́ ("older than him").
- The н- is a meaningless phonetic fossil — react to the trigger, don't try to interpret it.
Now practice Russian
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Start learning Russian→Related Topics
- Personal Pronouns and Their DeclensionA1 — The full system of Russian personal pronouns — я, ты, он, она́, оно́, мы, вы, они́ — declined across all six cases (я → меня́, мне, мной, обо мне; они́ → их, им, и́ми, них). Covers the obligatory н- that third-person pronouns add after a preposition (его́ кни́га but у него́), the fact that он/она́/оно́ refer to grammatically gendered things (Где стол? — Он там), and why Russian — unlike Spanish or Italian — usually keeps its subject pronouns rather than dropping them.
- Genitive: FormsA2 — The genitive (роди́тельный паде́ж) is one of the most-used and most-varied cases. The singular is tidy: masc/neuter -а/-я (стола́, окна́, музе́я), feminine -ы/-и (кни́ги, неде́ли, но́чи). The plural is the single hardest ending set in Russian — a three-way split between zero ending (often with a fleeting vowel: книг, о́кон, де́вушек), -ов/-ев (столо́в, музе́ев, отцо́в), and -ей (ноже́й, словаре́й, ноче́й). Learn the decision procedure, not a word list.
- Dative: FormsA2 — The dative (да́тельный паде́ж) answers кому? (to whom?). Singular: masc/neuter -у/-ю (столу́, музе́ю, окну́, мо́рю), feminine -а/-я → -е (кни́ге, неде́ле), feminine -ь → -и (но́чи), and the -ия/-ие → -ии exception (Росси́и, ле́кции). Plural is uniform across all genders: -ам/-ям (стола́м, кни́гам, моря́м, музе́ям). The pronoun datives are мне, тебе́, ему́/ей, нам, вам, им, себе́. The trap: the feminine dative singular looks identical to the prepositional (both кни́ге), so the FORM is shared but the FUNCTION differs.
- Instrumental: FormsA2 — The instrumental (твори́тельный паде́ж) endings. Singular: masc/neuter -ом/-ем (столо́м, окно́м, мо́рем), feminine -ой/-ей (кни́гой, неде́лей) and the special feminine -ь → -ью (но́чью, две́рью). Plural: -ами/-ями for everyone (стола́ми, дверя́ми), with irregular людьми́, детьми́. The choice of -ом vs -ем turns on the spelling rule and stress.
- Prepositional: FormsA1 — The prepositional (предло́жный паде́ж) endings — the one case that NEVER appears without a preposition. Singular: mostly -е (в столе́, в кни́ге, в окне́), but -ия/-ие/-ий and feminine -ь nouns take -и (в Росси́и, в зда́нии, о ле́кции, о но́чи). Plural: -ах/-ях for everyone (на стола́х, в кни́гах). Pronouns add н- after a preposition: о нём, о ней, о них.