The reflexives sig (object) and sin/sitt/sina (possessive) are subject-hunters: they always point back to a subject, and specifically to the nearest available subject. In a single simple clause that subject is obvious — there is only one. The advanced problem, and the one that separates fluent writers from intermediate ones, appears when clauses stack: a main clause embeds another clause, and there are now two candidate subjects. Which one does sin refer to? The answer is governed by a single, sharp distinction — whether the embedded clause is an infinitive (no finite subject of its own) or a finite att-clause (its own subject). That distinction quietly determines whose book, whose paper, whose car you are talking about, and English gives you no instinct for it whatsoever.
Local binding: sig and sin point to their own subject
Start with the foundation. Within one clause, sig and sin are bound by that clause's subject. Sig is the reflexive object — it marks that the object is the same person as the subject. Sin is the reflexive possessive — "his/her/its/their own", belonging to the subject.
Han tvättar sig varje morgon.
He washes himself every morning. 'sig' = the subject 'han'.
Hon tog sin bok och gick.
She took her (own) book and left. 'sin' = belonging to the subject 'hon' — her own book, not someone else's.
Barnen gömde sig under bordet.
The children hid (themselves) under the table. 'sig' refers back to the plural subject 'barnen'.
The crucial contrast English speakers must internalise is sin versus hans/hennes. Sin means the possessor is the subject; hans/hennes means the possessor is somebody else. So Hon tog sin bok is her own book, but Hon tog hennes bok means she took another woman's book. English "her book" is ambiguous between the two; Swedish forces you to choose, and the choice is information, not decoration. The full third-person contrast lives on Sin vs hans/hennes.
Hon tog hennes bok av misstag.
She took her (= another woman's) book by mistake. 'hennes' = NOT the subject; a different person's book.
Two subjects, one reflexive: the infinitive case
Now embed a clause. When a matrix verb takes an infinitive complement — bad mig (att) hämta…, bad honom (att) ta med… — that infinitive has no finite subject of its own. There is an understood doer, but no subject the reflexive can grab onto inside the infinitive. So sin reaches upward, out of the infinitive, to the matrix subject. This is the long-distance reflexive (more precisely, mid-distance, since it crosses only an infinitive boundary).
Han bad mig hämta sin tidning.
He asked me to fetch his (own) paper. 'sin' binds the MATRIX subject 'han' — HIS paper. The infinitive has no finite subject, so sin reaches up.
Han bad mig att ta med sin bok.
He asked me to bring his (own) book. Again 'sin' = the matrix subject 'han'; the book is his, not mine.
Hon lät barnen leka i sin trädgård.
She let the children play in her (own) garden. 'sin' reaches over the infinitive to the matrix subject 'hon' — her garden.
Read those carefully against your English instinct. In Han bad mig hämta sin tidning, the paper belongs to han (the asker), not to mig (the fetcher) — even though mig is the understood doer of hämta. Why? Because the only real subject in the sentence is han; the infinitive supplies no competing subject for sin to latch onto. The reflexive finds the nearest subject, and the nearest subject is the matrix one.
If you actually mean my paper, you cannot use sin — you switch to min:
Han bad mig hämta min tidning.
He asked me to fetch MY paper. Here 'min' = the speaker; sin would have meant HIS paper.
The finite att-clause blocks long-distance binding
Here is the boundary that changes everything. Swap the infinitive for a finite att-clause — att jag skulle…, att hon hade… — and a new subject appears inside the embedded clause. That embedded subject is now the nearest subject, so it captures sin (and sig). The reflexive can no longer reach the matrix subject across the finite boundary. To refer to the matrix subject's possession, you must drop sin entirely and use hans/hennes.
Han tror att hon har glömt sin bok.
He thinks that she has forgotten her (own) book. Across the finite 'att'-clause, 'sin' binds the EMBEDDED subject 'hon' — HER book.
Han tror att hon har glömt hans bok.
He thinks that she has forgotten HIS book. To mean the matrix subject 'han', you must switch to 'hans' — sin is blocked across the finite clause.
Han sa att jag skulle ta med min bok.
He said that I should bring my book. Inside the finite clause the subject is 'jag', so the possessive is 'min'; sin cannot reach 'han' here.
Lay the pair side by side and the rule jumps out. With the infinitive, sin = the matrix subject han. With the finite att-clause, sin = the embedded subject hon, and the matrix reading requires hans. The only difference between the two sentences is the clause type — infinitive versus finite — and that single structural fact flips who owns the book.
| Embedded clause type | Sentence | sin refers to… |
|---|---|---|
| Infinitive (no finite subject) | Han bad henne hämta sin bok. | the MATRIX subject 'han' (long-distance) |
| Finite att-clause (own subject) | Han tror att hon glömt sin bok. | the EMBEDDED subject 'hon' (local) |
Why the boundary matters: subjects, not meaning
The logic is purely structural, and that is what makes it hard for English speakers, who resolve "his/her" by meaning and context. In Swedish the rule is mechanical: sin hunts for a finite subject, taking the nearest one. An infinitive contributes no finite subject, so the search passes through it to the matrix clause. A finite clause contributes its own subject, which sits closer and wins. You never reason about who probably owns the book — the grammar has already decided, and a native reader decodes it instantly and unambiguously.
This is why the infinitive constructions on Non-finite Constructions are exactly the environments where long-distance sin lives. It also explains the genuine ambiguity in chains of infinitives, where there is only ever one finite subject to bind to:
Chefen bad honom be sekreteraren att boka sin resa.
The boss asked him to ask the secretary to book his/their trip. With only the matrix finite subject 'chefen' available across the infinitives, 'sin' most naturally points to the boss — though context can stretch it.
Honest caveat: variation in the mid-distance case
The finite-clause block is firm and uncontroversial — every native speaker rejects sin binding the matrix subject across a finite att-clause. The long-distance reading into an infinitive is the standard, accepted norm, but linguists who have tested speakers across regions find some inter-individual variation in how readily the matrix reading is preferred when a local reading is also conceivable. The safe rule for production: across an infinitive, sin = matrix subject; across a finite clause, sin = embedded subject, hans/hennes = matrix subject. When you want to be unmistakable, restructure (see Common Mistakes below) rather than rely on context.
Common Mistakes
❌ Han bad mig hämta hans tidning. (meaning HIS own paper)
Wrong for 'his own paper' — across an infinitive, the matrix subject's possession is 'sin', not 'hans'. 'hans' would point to a third man.
✅ Han bad mig hämta sin tidning.
He asked me to fetch his (own) paper.
❌ Han tror att hon har glömt sin bok. (meaning HIS book)
Wrong for 'his book' — across a finite att-clause, 'sin' binds the embedded subject 'hon' (= HER book). For the matrix subject use 'hans'.
✅ Han tror att hon har glömt hans bok.
He thinks that she has forgotten his book.
❌ Hon tog hennes egen bok.
Self-contradictory — 'egen' (own) demands the reflexive 'sin': 'sin egen bok'. 'hennes' marks a different person, which clashes with 'own'.
✅ Hon tog sin egen bok.
She took her own book.
❌ Han ringde sin fru och sa att sin bil var trasig.
Wrong — inside the finite att-clause the subject is implicitly the same 'han', but 'sin' cannot cross the finite boundary; use 'hans': 'att hans bil var trasig'.
✅ Han ringde sin fru och sa att hans bil var trasig.
He called his wife and said that his car was broken.
Key Takeaways
- Local rule: sig and sin bind the subject of their own clause (Hon tog sin bok = her own).
- sin = the possessor IS the subject; hans/hennes = the possessor is someone else. Swedish forces a choice English leaves vague.
- Across an infinitive (no finite subject), sin reaches up to the matrix subject — the long-distance reflexive (Han bad mig hämta sin tidning = HIS paper).
- Across a finite att-clause, the embedded subject captures sin; the matrix reading then requires hans/hennes (Han tror att hon glömt sin bok = HER book).
- The reflexive always takes the nearest finite subject; the clause type — infinitive vs finite — is the switch that decides which subject that is.
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- sin/sitt/sina vs hans/hennes/derasB1 — The decision procedure for Swedish's reflexive possessive. Use sin/sitt/sina ('one's own') when the owner is the third-person SUBJECT of the SAME clause; use hans/hennes/deras for everyone and everything else. 'Han tvättar sin bil' means he washes his OWN car; 'Han tvättar hans bil' means he washes some other man's car — a distinction English can't make in a single word. The hard part is embedded clauses, where 'sin' points to the nearest subject.
- The Reflexive Possessive sin/sitt/sinaB1 — sin/sitt/sina means 'his/her/its/their own' and points back to the subject of the same clause: Han älskar sin fru = his OWN wife, while Han älskar hans fru = some other man's wife. It agrees with the thing owned (like min/mitt/mina), is strictly 3rd-person and subject-bound — and, the detail competitors skip, can NEVER itself be part of the subject.
- Non-Finite Constructions (att + infinitive, för att)B2 — How Swedish builds subordinate ideas without a finite verb: the infinitive marker att (Det är svårt att lära sig svenska), the purpose clause för att + infinitive ('in order to'), and the genom att / utan att / istället för att family — plus the trap that för att means 'in order to' with an infinitive but 'because' with a finite verb.
- The Reflexive Pronoun sigA2 — When the object of a verb is the same person as the subject, Swedish 1st and 2nd persons just reuse the ordinary object pronoun (jag tvättar mig, du tvättar dig) — but the 3rd person has a dedicated reflexive word, sig, for he/she/it/they/one. Using honom or henne instead of sig flips the meaning to 'someone else', a mistake English's '-self' suffix makes very easy to fall into.