The reference rule for si/sia is local: inside a finite subordinate clause, it refers to the subject of that subordinate clause, never directly to the subject of the main clause. In Lina diris, ke Marko vidis sin, sin means Marko, not Lina. Here finite means that the clause is built around a verb ending in -as, -is, -os, -us, or -u, rather than an infinitive in -i.
Each embedded finite clause creates a new local domain. If it has a subject, that subject is the local center for reflexive reference. If it is subjectless, it cannot license si/sia at all.
This is the normative rule stated in detailed Esperanto grammar and Akademio guidance. It is also the safest production rule across neutral speech and formal writing.
One finite clause, one local subject
Start with a simple clause. A third-person subject can recur as sin (object), si (after a preposition), or sia (possessive).
Marta lavis sin kaj poste sekigis siajn harojn.
Marta washed herself and then dried her hair.
Both reflexives point to Marta, the subject shared by the coordinated verbs lavis and sekigis. Coordination with no new subject does not automatically create a new clause center.
Now add a finite ke-clause:
Marta diris, ke Leo lavis sin.
Marta said that Leo washed himself.
The finite verb lavis has its own explicit subject, Leo. Therefore sin belongs to Leo. It cannot refer back across ke to Marta.
Ke-clauses reset si and sia
A ke-clause reports a proposition with its own subject. Compare the local reflexive with an ordinary pronoun that points back to the main clause:
Eva diris, ke Sofia prenis sian mantelon.
Eva said that Sofia took her own coat.
Eva diris, ke Sofia prenis ŝian mantelon.
Eva said that Sofia took her coat—the coat of Eva or another woman, not Sofia's own.
The first coat belongs to Sofia because Sofia is the subject of prenis. In the second, ŝian points away from Sofia and needs context to identify a different woman, perhaps Eva.
This holds even when the subordinate subject happens to refer to the same real-world person as the main subject:
Mia avo diris, ke li tre amis sian patrinon.
My grandfather said that he loved his mother very much.
Grammatically, sian refers to li, the subject of amis. Context may establish that li is the grandfather, but sia does not jump directly to mia avo. It first connects locally to li.
Ordinary pronouns cross boundaries; reflexives do not
When the intended referent is the main-clause subject, use an ordinary third-person pronoun inside the subordinate clause.
Sofia petis, ke ni helpu ŝin.
Sofia asked us to help her.
The subject of helpu is ni, so sin cannot point back to Sofia—and a reflexive meaning “ourselves” would in fact require nin. To point back to Sofia across the boundary, Esperanto uses ŝin.
La instruistoj volas, ke ni legu ilian raporton.
The teachers want us to read their report.
The report belongs to the main-clause subject la instruistoj, not to subordinate ni. Therefore use ilian, not sian or nian.
Karlo diris, ke estis tro malfacile sen li.
Karlo said that it had been too difficult without him.
The subordinate clause estis tro malfacile sen li is impersonal and has no subject. It therefore has no local antecedent for si; ordinary li points back to Karlo across the clause boundary.
English speakers often rely on the meaning of himself/herself without first separating the clauses. Esperanto makes the syntactic boundary decisive.
Questions and negative subordinate clauses
The rule does not depend on ke itself. An embedded question also has its own finite verb and subject.
Ana demandis, ĉu Petro kunportis sian pasporton.
Ana asked whether Petro had brought his own passport.
Ana ne sciis, kial Petro koleris kontraŭ si.
Ana did not know why Petro was angry with himself.
In both sentences, Petro is the local subject. Neither sian nor si can refer to Ana.
Ĉu Lea diris, ke Marko ne fidas sin? — Jes, sed mi ne scias kial.
Did Lea say that Marko doesn't trust himself? — Yes, but I don't know why.
Negation and question structure do not alter the reflexive relationship.
Relative clauses establish their own center
A relative clause introduced by kiu also has a local subject. If kiu is the subject, si/sia within that relative clause refers to the person or thing represented by kiu.
Elizabeto rigardis la viron, kiu kombis al si la harojn.
Elizabeto watched the man who was combing his own hair.
The man is the subject kiu of kombis, so si refers to the man, not to Elizabeto.
Mi renkontis verkiston, kiu ofte ilustras siajn proprajn librojn.
I met a writer who often illustrates their own books.
Again, siaj belongs to kiu, whose antecedent is verkiston. Person and number come from that antecedent; agreement -j comes from plural librojn.
If the relative pronoun is not the subject, find the actual subject:
Jen la kuracisto, kiun Marta invitis al sia domo.
Here is the doctor whom Marta invited to her own house.
Inside the relative clause, Marta is the subject and kiun is the object. Therefore sia domo is Marta’s house, not the doctor’s.
Ambiguity can remain before sia does its job
Reflexive grammar does not resolve the reference of an ordinary pronoun. Consider:
Ana diris al Eva, ke ŝi prenis sian sakon.
Ana told Eva that she took her own bag.
Ŝi could refer to Ana or Eva if context does not decide. Once the listener identifies the referent of ŝi, sian clearly means that same woman’s own bag. To eliminate the first ambiguity, repeat the name:
Ana diris al Eva, ke Eva prenis sian sakon.
Ana told Eva that Eva took her own bag.
Explicit repetition is not inelegant when it prevents a genuine reference failure. Esperanto’s system is precise about the reflexive relation, not clairvoyant about discourse context.
Reported speech and shifts of viewpoint
In direct speech, pronouns are chosen from the speaker’s viewpoint. In indirect reported speech, the reporting sentence supplies new grammatical persons and clause boundaries.
Karlo diris: “Mi trovos mian bileton.”
Karlo said, 'I will find my ticket.'
Karlo diris, ke li trovos sian bileton.
Karlo said that he would find his ticket.
In the indirect version, li is the subordinate subject and sian refers locally to li. Esperanto does not change tense merely because speech is reported, but it does change pronouns to match the new viewpoint.
For more complex reporting choices, see Pronouns in Reported Speech.
What this rule does not settle
Infinitives and participles are non-finite: they do not show tense/person in the same way, and their understood subject may or may not be explicitly present. Established usage has additional principles and some genuinely difficult cases. Do not extend the simple finite-clause rule mechanically. Use the dedicated pages Si with Infinitives and Si with Participles.
In advanced constructions involving object complements, comparisons, and compressed clauses, usage can show variation. The firm rule on this page remains: a reflexive inside an ordinary finite subordinate clause belongs to that subordinate clause’s subject.
Common Mistakes
1. Letting sin refer to the main-clause subject
❌ Lina diris, ke Marko fotis sin.
Incorrect if sin is intended to mean Lina; it refers to Marko.
✅ Lina diris, ke Marko fotis ŝin.
Lina said that Marko photographed her.
2. Letting sian skip the subordinate subject
❌ Petro diris, ke Johano riparos sian biciklon.
Incorrect if the intended bicycle belongs to Petro; sian belongs to Johano.
✅ Petro diris, ke Johano riparos lian biciklon.
Petro said that Johano would repair his bicycle—Petro's in the intended context.
Because lian could still denote another man, repeat la biciklon de Petro when context is weak.
3. Using si as the subordinate subject
❌ Eva esperas, ke si venkos.
Incorrect — si cannot be a subject in any clause.
✅ Eva esperas, ke ŝi venkos.
Eva hopes that she will win.
4. Missing the subject of a relative clause
❌ Mi vidis la virinon, kiun Karlo fotis kun sia infano.
Wrong if the child belongs to the woman; sia refers to Karlo, the subject of fotis.
✅ Mi vidis la virinon, kiun Karlo fotis kun ŝia infano.
I saw the woman whom Karlo photographed with her child.
5. Making sia agree with its possessor
❌ Ili diris, ke la knabo prenis siajn jakon.
Incorrect — siajn cannot modify singular jakon.
✅ Ili diris, ke la knabo prenis sian jakon.
They said that the boy took his own jacket.
Key Takeaways
- Every ordinary finite subordinate clause creates a new binding domain; when it has a subject, that subject is its reflexive center.
- Inside that clause, si/sia refers to the local third-person subject, never directly to a main-clause subject.
- Use ordinary lin/ŝin/ĝin/ilin or lia/ŝia/ĝia/ilia to point across a clause boundary.
- Relative and embedded-question clauses follow the same local rule.
- Sia clarifies local possession but cannot by itself resolve an ambiguous subject pronoun such as ŝi.
Related Topics
- The Reflexive Pronoun SiA1 — Use si and sin when a third-person subject refers back to itself, and distinguish reflexive reference from ordinary third-person pronouns.
- The Possessive SiaA1 — Use sia for a third-person subject's own possession and make it agree with the possessed noun.
- Si with InfinitivesA1 — Resolve si and sia by finding the understood subject of an infinitive, including control and omitted-agent constructions.
- Si with ParticiplesA2 — Resolve reflexive reference with adjectival, adverbial, and nominal participles by identifying what each participle belongs to.
- Pronouns in Reported SpeechB1 — Shift personal and possessive pronouns according to the current reporter and listener while preserving clause-bound reflexive reference.
- Ke-ClausesA2 — How finite clauses introduced by ke function as statements, subjects, objects, complements, and content descriptions.