Russian / Verb Morphology

The particle ся

A worn-down "self" that hooks onto the end of a verb, after every other ending, and quietly changes what the verb does. Tap any speaker to hear it.

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Where it comes from
себя́ becomes ся / сь
"oneself" collapsed into a particle stuck on the verb

It is a postfix: it lands after the personal ending, not before it. You conjugate the verb completely as normal, then tack ся on the very end.

сяafter a consonant or ь
у́чится, у́чишься
сьafter a vowel
учу́сь, у́читесь
Conjugation: учи́ться

to study, to be a student

яучу́сь
тыу́чишься
он / она́у́чится
мыу́чимся
выу́читесь
они́у́чатся
Watch the particle flip: учу́сь and у́читесь take сь because a vowel sits in front. Everything else takes ся.
учи́ть versus учи́ться

Adding the particle does not just mean "teach yourself." It swaps a verb that takes an object for one that cannot.

учи́ть
to teach, or to study something specific (takes a direct object)
Она́ у́чит ру́сский.
She is studying Russian.
учи́ться
to learn, to be a student (no object)
Она́ у́чится в университе́те.
She studies at the university.
The most useful pattern in the language: ся takes a transitive verb (one that acts on an object) and makes it intransitive (no object). Learn that flip and most reflexive verbs stop being mysterious.
Spelling: у́чится versus учи́ться

One soft sign separates the infinitive from the conjugated form, and Russian gives you a built-in test.

учи́ться
to study (infinitive)
answers что де́лать?
the question has a ь, so the verb does too
у́чится
he / she studies (3rd person)
answers что де́лает?
no ь in the question, none in the verb
Quick test: if English would use "to" (the infinitive), keep the ь. It hides in front of the particle: учи́ться.
The five jobs of ся
01True reflexive

The action loops back onto the subject. The literal "self" meaning.

Он мо́ет маши́ну.He washes the car.
Он мо́ется.He washes (himself).
02Only exists with the particle

Some verbs never appear without it. Nothing to "undo," just learn them whole.

улыба́тьсяto smile
смея́тьсяto laugh
боя́тьсяto be afraid
наде́ятьсяto hope
03Transitive to intransitive

The workhorse. Turns "do X to something" into "be in the state of X." This is учи́ться.

Я учу́ слова́.I'm learning words.
Я учу́сь.I'm studying / a student.
04Passive

Something has the action done to it. Common in writing.

Дом стро́ится.The house is being built.
Кни́га чита́ется легко́.The book reads easily.
05Reciprocal ("each other")

Two or more subjects act on one another.

Они́ встреча́ются.They meet / are dating.
Они́ целу́ются.They kiss (each other).
The only other postfixes

True postfixes (particles glued after the ending) are rare. This is essentially the whole set, so nothing else of this kind will ambush you.

ся / сьreflexive, the one on this page
тоspecific but unknownкто-то = someone
нибу́дьany one will doчто-нибу́дь = something
ли́боanyone at all (bookish)кто-ли́бо = anyone
каsoftens a commandдай-ка = go on, give it here
The verbs that change meaning constantly are built with prefixes (about 20 of them) and derivational suffixes (many). Those you meet word by word in context, never as a list.
One thing to remember

You do not need any of this to start speaking. Я учу́сь already says "I'm studying," and you can say true things today with present tense and a handful of verbs. Grammar is cleanup after you have already been wrong out loud. Meet ся in the wild, then come back to this page.