English has no single word for this, and that is precisely why свой is hard. Свой means "one's own" — but more exactly, it means "belonging to whoever the subject of this clause is." It is a reflexive possessive: it always points back to the grammatical subject. Where English leaves "his wife" ambiguous (his own? another man's?), Russian resolves the ambiguity by choosing свой (the subject's own) versus его́ (someone else's). Свой declines exactly like мой, agreeing with the possessed noun in gender, number and case — but which possessor it names is fixed by the rule, not by its form. Getting свой right is one of the clearest markers of a learner who has crossed into real fluency.
What it means: it refers back to the subject
The owner свой points to is never spelled out by свой itself — it is read off the subject of the clause. So свой shape-shifts in meaning with the subject while keeping a single translation, "one's own":
- Я люблю́ свою́ рабо́ту. — I love my (own) job.
- Ты лю́бишь свою́ рабо́ту. — You love your (own) job.
- Он лю́бит свою́ рабо́ту. — He loves his (own) job.
- Мы лю́бим свою́ рабо́ту. — We love our (own) job.
In every case свою́ = "the subject's own". For first and second person (я, ты, мы, вы) you can usually swap in мой/твой/наш/ваш with little change of meaning. The place where свой becomes essential is the third person, because that is where the его́ / свой contrast carries real information.
Я забы́л до́ма свой телефо́н.
I left my phone at home. (свой = the subject's own; мой would also be fine here in the 1st person)
The contrast that matters: свой vs. его́ in the 3rd person
This is the heart of the page. With a third-person subject, свой = the subject's own thing; его́/её/их = somebody else's:
Он лю́бит свою́ жену́.
He loves his own wife. (свою́ points back to the subject 'он')
Он лю́бит его́ жену́.
He loves his wife — i.e. another man's wife. (его́ points away from the subject)
The two sentences differ by one word and describe two very different situations. A learner who reaches for его́ "because the owner is male" can accidentally accuse a man of loving someone else's spouse. The rule to internalise: when the possessor is the subject of the clause, use свой — for the third person this is effectively obligatory if you mean "his/her/their own".
Ма́ша взяла́ свою́ су́мку, а Ле́на — её.
Masha took her own bag, and Lena took hers (Masha's). (свою́ = Masha's own; её = the other person's)
Дире́ктор уво́лил своего́ замести́теля.
The director fired his (own) deputy. (своего́ — the deputy belongs to the subject, the director)
Full declension
Свой declines on the same template as мой — masculine and neuter share most forms, the feminine has its own set, the plural is unified. Свой and the masculine/monosyllabic forms take no stress mark; the multi-syllable forms are end-stressed.
| Case | Masc. | Neuter | Fem. | Plural |
|---|---|---|---|---|
| Nom. | свой | своё | своя́ | свои́ |
| Gen. | своего́ | своего́ | свое́й | свои́х |
| Dat. | своему́ | своему́ | свое́й | свои́м |
| Acc. | = nom./gen.* | своё | свою́ | = nom./gen.* |
| Inst. | свои́м | свои́м | свое́й | свои́ми |
| Prep. | о своём | о своём | о свое́й | о свои́х |
* Masculine and plural accusative follow the animacy rule: animate copies the genitive (своего́ бра́та, свои́х друзе́й), inanimate copies the nominative (свой дом, свои́ дома́). See the accusative animacy rule.
Расскажи́ о свои́х пла́нах на ле́то.
Tell me about your plans for the summer. (prepositional свои́х after о; subject = the implied 'you' of the imperative)
Она́ горди́тся свои́м сы́ном.
She's proud of her son. (instrumental свои́м, agreeing with сы́ном; subject = она́)
Where свой is impossible: the subject slot
Because свой must refer back to a subject, it cannot itself sit in the subject. There is nothing earlier in the clause for it to point to. So you cannot say Свой брат пришёл to mean "His own brother came" — the possessor of the subject brother is not named in the clause, so свой has no anchor.
❌ Свой брат пришёл.
Incorrect — свой can't fill the subject slot; it has no subject to refer back to. Use Его́ брат пришёл ('His brother came').
✅ Его́ брат пришёл, и я уви́дел своего́ дру́га.
His brother came, and I saw my (own) friend. (his = его́ on the subject; своего́ is fine in the object, pointing back to я)
A frequent fixed exception is the proverb-like idiom Своя́ руба́шка бли́же к те́лу ("one's own shirt is closer to the body" = charity begins at home), where свой is lexicalised — but as a productive rule, keep свой out of the subject.
The idiom свой челове́к
Свой also lives a life of its own as a noun-like word meaning "one of us / an insider / one's own people". Свой челове́к is someone trusted, part of the in-group; the plural свои́ means "our people, our side".
Не волну́йся, он свой челове́к.
Don't worry, he's one of us. (свой челове́к — idiomatic 'insider', not literally 'his own person')
На войне́ ва́жно отличи́ть свои́х от чужи́х.
In war it's vital to tell your own side from the enemy. (свои́х 'our people' vs. чужи́х 'strangers/the enemy')
How this differs from English
English has no reflexive possessive. We say "his", "her", "their" and rely on context (or add "own") to clear up whose. Russian builds the distinction into the grammar and makes it largely obligatory in the third person. The closest English analogue is the emphatic "his own", but Russian свой is not emphatic — it is the default way to say "the subject's", and using его́ instead is a positive signal that you mean somebody else's. So the danger runs in one direction for English speakers: you under-use свой and over-use его́/её/их, and the result quietly says the wrong thing.
Common Mistakes
❌ Он потеря́л его́ ключи́.
Incorrect if you mean his OWN keys — его́ says they belong to another man. The subject's own thing takes свой.
✅ Он потеря́л свои́ ключи́.
He lost his (own) keys. (свои́, possessor = the subject он)
❌ Я люблю́ его́ страну́.
Incorrect if 'his' = the subject himself in a 3rd-person frame; with a 1st-person subject use свой for 'my own'. (Here it would mean ANOTHER person's country.)
✅ Ка́ждый лю́бит свою́ страну́.
Everyone loves their own country. (свою́, subject = ка́ждый)
❌ Свой оте́ц рабо́тает врачо́м.
Incorrect — свой can't be the subject; nothing for it to refer to. Use Его́ оте́ц…
✅ Его́ оте́ц рабо́тает врачо́м.
His father works as a doctor. (subject slot needs его́, not свой)
❌ Она́ помога́ет ей ма́тери.
Incorrect if the mother is the subject's own — ей is the wrong word entirely and breaks agreement; use свое́й.
✅ Она́ помога́ет свое́й ма́тери.
She helps her (own) mother. (dative свое́й, subject = она́)
Key Takeaways
- свой = "the subject's own" — a reflexive possessive that always points back to the clause's subject.
- It agrees with the possessed noun (свой/своя́/своё/свои́), declining exactly like мой.
- The crucial contrast is third-person: свой = the subject's own (Он лю́бит свою́ жену́); его́/её/их = someone else's (Он лю́бит его́ жену́).
- For a third-person subject, свой is effectively obligatory when you mean "his/her/their own".
- свой cannot be the subject — *Свой брат пришёл is wrong (no antecedent); use его́.
- Idiom: свой челове́к = "one of us / an insider"; свои́ = "our own people".
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- His, Her, Their: его́, её, ихA1 — его́ (his/its), её (her) and их (their) are frozen genitive forms of он, она́, они́ — they never decline and never agree (его́ брат, его́ сестра́, его́ кни́ги, о его́ кни́ге). This page contrasts them with the agreeing мой/наш, warns about the его́ vs. него́ split, flags substandard *ихний, and shows how свой changes the meaning.
- Possessive Pronouns (мой, твой, наш, ваш)A1 — The possessives мой, твой, наш and ваш agree in gender, number and case with the thing possessed — not with the possessor. This page gives the full agreement and declension tables (мой брат, моя́ сестра́, моё окно́, мои́ друзья́; моего́ бра́та, мое́й сестре́) and explains why English speakers keep forgetting to decline them.
- 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.
- The Animacy Rule in the AccusativeA2 — The single rule that shapes the Russian accusative: animate objects (people, animals) copy the genitive, inanimate objects (things) copy the nominative. It bites in exactly two places — the masculine singular (ви́жу стол vs ви́жу студе́нта) and the plural of every gender (ви́жу столы́ vs ви́жу студе́нтов/же́нщин/дете́й). Feminine -а/-я singulars are the exception: they take -у/-ю either way. A few nouns are grammatically animate against common sense (ку́кла, ферзь, мертве́ц).