The particle -ся (spelled -сь after a vowel) looks like one small thing, but it is a hard-working morpheme that does at least eight different jobs. The intro page (reflexive verbs) gave you the working map and the spelling rule; this page is the complete taxonomy, one section per function, each with labelled examples. The single most important idea to carry through all eight is this: -ся is only occasionally a true "self". Far more often it makes the verb turn inward — the action stops reaching out to an object and instead happens by itself, to each other, or as a state of the subject. The structural consequence flows directly from that: because a -ся verb has no outward action, it cannot take an accusative direct object. That is why -ся verbs that still want a complement reach for the genitive, instrumental, or prepositional case instead — tying this morphology straight into the case system (detailed on government of -ся verbs).
1. True reflexive — the action turns back on the doer
The literal "do X to oneself", where the subject is both the doer and the receiver. This is genuinely the smallest group and mostly covers grooming the body. Here -ся really is the old "self" pronoun fused on.
По утра́м я умыва́юсь холо́дной водо́й.
In the mornings I wash my face with cold water. — умыва́ться: wash oneself, a true reflexive.
Сы́ну три го́да, а он уже́ сам одева́ется.
My son is three and already dresses himself. — одева́ться: dress oneself.
A test: a true reflexive can be paraphrased with себя́ ("oneself") and still make sense (мыть себя́ = мы́ться "wash oneself"). For most -ся verbs below, that paraphrase fails — proof they are not true reflexives. For the себя́ pronoun itself, see its own page in the pronouns section.
2. Reciprocal — "each other"
Two or more people doing something to one another. Here -ся corresponds to English "each other / one another".
Мы с бра́том ре́дко ви́димся — он живёт в друго́м го́роде.
My brother and I rarely see each other — he lives in another city. — ви́деться: reciprocal.
Они́ познако́мились в университе́те и че́рез год пожени́лись.
They met at university and got married a year later. — познако́миться 'get to know each other', пожени́ться 'marry each other'.
Не ссо́рьтесь по пустяка́м!
Don't quarrel over trifles! — ссо́риться: reciprocal (quarrel with one another).
Other high-frequency members: целова́ться "kiss", обнима́ться "hug", обща́ться "interact", догова́риваться "come to an agreement". The full set is on reciprocal verbs.
3. Intransitive / "middle" — the action happens by itself
The most useful category for English speakers. A transitive verb (with -ся stripped) means "do X to something"; the -ся version means "X happens by itself", with no object. English collapses both into one word — "I open the door / the door opens" — but Russian keeps them visibly distinct. Grammarians call this the middle voice (decausative): the cause drops out of view.
| Transitive (takes an object) | Intransitive -ся (no object) |
|---|---|
| открыва́ть дверь "open the door" | дверь открыва́ется "the door opens" |
| начина́ть уро́к "start the lesson" | уро́к начина́ется "the lesson begins" |
| изменя́ть пла́ны "change the plans" | пла́ны изменя́ются "the plans change" |
| остана́вливать маши́ну "stop the car" | маши́на остана́вливается "the car stops" |
Заседа́ние начало́сь во́время, без опозда́ний.
The meeting started on time, no delays. — нача́ться: it began by itself (the past начало́сь shows -сь after the vowel).
С во́зрастом интере́сы меня́ются.
Interests change with age. — изменя́ться/меня́ться: change by itself, no agent named.
4. Emotion and mental state
A large set of verbs about feelings, perceptions, and reactions simply carry -ся with no "self" sense at all. The subject experiences a state rather than acting on anything.
Не бо́йся, всё бу́дет хорошо́.
Don't be afraid, everything will be fine. — боя́ться 'fear', not 'fear oneself'.
Все засмея́лись, а ей бы́ло не до сме́ха.
Everyone burst out laughing, but she was in no mood for it. — смея́ться 'laugh'.
Я наде́юсь, что мы ещё уви́димся.
I hope we'll see each other again. — наде́яться 'hope'.
Я удиви́лся, уви́дев его́ здесь.
I was surprised to see him here. — удивля́ться 'be surprised'; ра́доваться 'rejoice' works the same way.
Crucially, many of these cannot take an accusative and instead govern a fixed case: боя́ться + genitive (бою́сь соба́ки), удивля́ться/ра́доваться + dative (удивля́юсь результа́ту), горди́ться + instrumental (горжу́сь тобо́й). This is the morphology-meets-case point — covered in full on government of -ся verbs.
5. Passive — the imperfective -ся passive
With an imperfective transitive verb, -ся builds a passive: the subject is the thing acted upon, and the doer (if mentioned) goes into the instrumental. This is a written/formal device for ongoing or repeated processes.
Э́тот мост стро́ится уже́ три го́да.
This bridge has been under construction for three years. — стро́иться: imperfective -ся passive (it is being built).
Зада́чи реша́ются по о́череди.
The problems are solved one by one. — реша́ться: passive, an ongoing process.
For completed results, Russian prefers a short past passive participle (Мост постро́ен) rather than -ся — the boundary between the two is mapped on the -ся passive in detail.
6. Impersonal — no subject at all
Here -ся builds a subjectless construction expressing how an activity goes for someone, with the person in the dative. There is no "I" doing the verb; the verb is frozen in the third-person singular (neuter in the past). These describe involuntary states and inclinations.
Мне сего́дня совсе́м не рабо́тается.
I just can't get any work done today. — рабо́таться (impersonal): no subject, dative мне; 'work isn't going for me'.
Но́чью ему́ не спало́сь.
He couldn't sleep at night. — не спи́тся / не спало́сь: an involuntary state, dative ему́.
Мне хо́чется чего́-нибудь сла́дкого.
I feel like something sweet. — хо́чется (impersonal): a softer, less willed 'I want', dative мне + genitive object.
These belong to the wider family of subjectless sentences — see impersonal constructions.
7. Characteristic / potential — "tends to do X"
A neat, often-missed function: -ся can mark a characteristic property or tendency of the subject — what it is prone to do, in general, to anyone. The verb has no specific object; it describes the subject's nature.
Осторо́жно, э́та соба́ка куса́ется!
Careful, this dog bites! — куса́ться: not biting anyone in particular, it's the dog's nature (it's a biter).
Не тро́гай крапи́ву — она́ жжётся.
Don't touch the nettle — it stings. — жжётся: a characteristic property of nettles.
Ко́шка ца́рапается, когда́ её беру́т на ру́ки.
The cat scratches when you pick it up. — ца́рапаться: a tendency, not one specific scratch.
Contrast куса́ть (transitive, "bite someone": соба́ка куса́ет челове́ка) with куса́ться (characteristic, "be a biter"). The -ся version drops the object precisely because the point is the general trait, not a victim.
8. Intensive-total — to satiety or excess (на-...-ся, раз-...-ся)
Finally, -ся combines with certain prefixes to mark an action done thoroughly, to one's fill, or to excess. The classic is на-...-ся ("do X to satiety"): the action is carried out until the doer has had enough. A second pattern, раз-...-ся, means "get worked up / get going". These overlap with the prefixed "ways of action" (спо́собы де́йствия) covered on perfective prefix meanings.
Мы так наговори́лись за ночь, что не оста́лось тем.
We talked so much through the night that we ran out of topics. — наговори́ться (на-...-ся): talk to one's heart's content.
Наконе́ц-то вы́спался по́сле неде́ли без сна.
I finally got enough sleep after a week without it. — вы́спаться: sleep one's fill (the prefix вы́- + -ся).
Де́ти нае́лись и убежа́ли игра́ть.
The kids ate their fill and ran off to play. — нае́сться (на-...-ся): eat to satiety.
К ве́черу он совсе́м расшуме́лся.
By evening he had got really loud / worked up. — расшуме́ться (раз-...-ся): get going, work oneself up.
A note on the lexicalized -ся-only verbs
Cutting across several of the categories above is a set of verbs that simply have no form without -ся — there is no боя́ть, no смея́, no наде́ять. The particle is welded on and you memorise the whole word. The high-frequency block is worth learning together: *боя́ться (fear), смея́ться (laugh), улыба́ться (smile), наде́яться (hope), нра́виться (be pleasing = "like"), станови́ться (become), горди́ться (be proud), учи́ться (study), занима́ться (be busy with / study), стара́ться (try). These are not a ninth meaning — they are spread across the emotion, reciprocal, and middle types — but they share the trait of being -ся-only.
Мне о́чень нра́вится твоя́ но́вая причёска.
I really like your new haircut. — нра́виться exists only with -ся; the liker is dative (мне), the thing liked is the subject.
Common Mistakes
❌ Я бою́сь себя́ темноты́.
Redundant 'self' — боя́ться already turns inward; it never means 'fear oneself'. And it takes the genitive directly.
✅ Я бою́сь темноты́.
I'm afraid of the dark. — боя́ться + genitive (темноты́), no себя́.
❌ Уро́к начина́ет в де́вять.
Missing -ся — without it, начина́ть is transitive ('starts what?'). 'The lesson begins by itself' needs the middle -ся.
✅ Уро́к начина́ется в де́вять.
The lesson begins at nine. — intransitive начина́ться.
❌ Я горжу́сь тебя́.
Wrong case — a -ся verb can't take an accusative. горди́ться governs the instrumental.
✅ Я горжу́сь тобо́й.
I'm proud of you. — горди́ться + instrumental (тобо́й).
❌ Соба́ка куса́ет, не подходи́. (meaning 'it's a biter, in general')
Wrong nuance — bare куса́ть needs an object ('bites whom?'). For the general trait 'it bites / is a biter' use the characteristic -ся.
✅ Соба́ка куса́ется, не подходи́.
The dog bites, don't go near. — characteristic куса́ться, no object.
❌ Мне не сплю сего́дня.
Wrong structure — the impersonal 'can't sleep' is subjectless with a dative experiencer, not a first-person verb.
✅ Мне сего́дня не спи́тся.
I can't sleep today. — impersonal спи́тся, dative мне.
Key Takeaways
- -ся does at least eight jobs: (1) true reflexive (умыва́ться), (2) reciprocal (встреча́ться), (3) intransitive/middle (открыва́ться), (4) emotion/state (боя́ться), (5) passive (стро́ится), (6) impersonal (хо́чется, не спи́тся), (7) characteristic/potential (соба́ка куса́ется), (8) intensive-total (нае́сться, вы́спаться).
- The unifying idea is not "self" but "the verb turns inward / loses its object" — the action happens by itself, to each other, or as a state.
- Because a -ся verb has no accusative object, those that take a complement govern other cases: боя́ться + genitive, горди́ться + instrumental, удивля́ться + dative — see government of -ся verbs.
- The impersonal type (Мне не рабо́тается, Мне хо́чется) is subjectless with a dative experiencer — part of the wider impersonal constructions.
- A core block of verbs is -ся-only (боя́ться, смея́ться, наде́яться, нра́виться, учи́ться, горди́ться): memorise them whole, since no form without -ся exists.
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- Reflexive Verbs (-ся / -сь)A2 — The particle -ся (after a consonant) / -сь (after a vowel) attaches AFTER the personal ending — умыва́ю → умыва́юсь, у́чится, учи́лся / учи́лась / учи́лись. It rarely means 'oneself': most -ся verbs are intransitive (открыва́ться), reciprocal (встреча́ться), or emotional (боя́ться, смея́ться, нра́виться). The key pattern is the transitive/intransitive pair открыва́ть / открыва́ться.
- Reciprocal Verbs (Each Other)B1 — Russian builds 'each other' into the verb itself: a -ся verb like встреча́ться 'meet up', цело́ваться 'kiss', or ссо́риться 'quarrel' already means two parties acting on each other, with no separate word for 'each other'. The partner is named with с + instrumental (встреча́ться с дру́гом). When you do need an explicit 'each other' — especially with non-reflexive verbs — Russian uses друг дру́га, which declines and, unusually, wraps a preposition in its middle: друг с дру́гом 'with each other', друг о дру́ге 'about each other'.
- Government of Reflexive VerbsB1 — A -ся verb is intransitive — it can NEVER take an accusative direct object. Instead these high-frequency verbs demand fixed cases: боя́ться + genitive (бою́сь темноты́), занима́ться / интересова́ться / по́льзоваться / горди́ться + instrumental (занима́юсь спо́ртом), and many govern a preposition (наде́яться на, относи́ться к, нужда́ться в). The error to kill: *бою́сь соба́ку → бою́сь соба́ки.
- The -ся Passive in DetailB2 — The imperfective half of the passive: an inanimate patient as nominative subject + a 3rd-person -ся verb + an optional agent in the INSTRUMENTAL (Дом стро́ится рабо́чими 'the house is being built by workers'). It is IMPERFECTIVE only — completed results use быть + a participle (Дом постро́ен). The construction is bookish; ordinary speech recasts it as the indefinite-personal active (Дом стро́ят).
- Impersonal ConstructionsB1 — Russian has whole sentences with NO nominative subject, where the verb sits frozen in the 3rd-person singular (present) or neuter (past). Types: dative-experiencer states (Мне хо́лодно), weather/nature (Темне́ет, Похолода́ло), natural-force instrumentals (Доро́гу занесло́ сне́гом), reflexive-impersonals (Мне не спи́тся, Хо́чется ча́я), and the 3rd-plural indefinite-personal (Говоря́т, Здесь не ку́рят). Where English forces a dummy 'it' or 'one', Russian simply has no subject.
- Why This Prefix? Choosing the Perfective PartnerB2 — Which prefix perfectivizes a given imperfective is a lexical property you must learn WITH the verb, like gender (писа́ть→на-, чита́ть→про-, де́лать→с-). But many prefixes do more than perfectivize — they add a 'way of action' (спо́соб де́йствия): ЗА- begins, ПО- does a bit, ПРО- does throughout (or misses), ДО- finishes, ПЕРЕ- redoes, НА-...-СЯ does to satiety, РАЗ-...-СЯ gets going, ВЗ- does suddenly. Picking the wrong prefix often makes a DIFFERENT verb (переписа́ть 'rewrite' ≠ написа́ть 'write').