A subordinate clause (bisats) is a clause that cannot stand alone — it leans on a main clause, introduced by a word like att ("that"), om ("if/whether"), när ("when"), eftersom ("because") or som ("that/which/who"). The single most important fact about it is that Swedish word order inside a subordinate clause is different from a main clause. The V2 rule that governs main clauses is switched off; instead a rigid internal frame takes over. This page lays out that frame, shows how a whole subordinate clause behaves as one building block, and explains the most consequential side-effect: when you put a subordinate clause first, the main verb jumps over the comma.
The fixed internal order
A main clause runs on the V2 rule — the finite verb is glued to second position no matter what comes first. A subordinate clause does not. Once the subordinator opens the clause, the order is locked:
subordinator — subject — sentence adverb — finite verb — rest
The thing that trips up every English speaker is where the sentence adverb (inte, alltid, ofta, kanske) sits: in a subordinate clause it comes before the finite verb, not after it. This is the heart of the BIFF rule — I Bisats kommer Inte *Före Finita verbet ("in a subordinate clause, *inte comes before the finite verb"). The mnemonic names inte, but it covers the whole class of sentence adverbs.
Jag vet att hon inte kommer ikväll.
I know that she isn't coming tonight. Inside the att-clause: subject 'hon' → adverb 'inte' → verb 'kommer'. In a main clause it would be 'hon kommer inte'.
Han säger att han alltid äter frukost klockan sju.
He says that he always eats breakfast at seven. The adverb 'alltid' sits before the verb 'äter' — the subordinate frame, not main-clause order.
Compare the two orders directly, because the contrast is the whole lesson:
| Subject | Adverb | Finite verb | Rest | |
|---|---|---|---|---|
| Main clause | Hon | kommer inte | ikväll. | |
| Subordinate (efter att) | hon | inte | kommer | ikväll. |
In the main clause, kommer fronts to second position and inte lands after it. In the subordinate clause, kommer stays put and inte slips in front of it. Nothing has been added or removed — only the order of inte and the verb has flipped.
The att-clause as object
The commonest subordinate clause is an att-clause working as the object of a verb of thinking, saying or knowing — tro ("believe"), veta ("know"), tycka ("think/feel"), säga ("say"), hoppas ("hope"). The whole att-clause fills the slot a noun object would.
Jag tror att det regnar ute.
I think (that) it's raining outside. The att-clause 'att det regnar ute' is the object of 'tror' — exactly where a noun like 'regn' would go.
Vi hoppas att ni inte är arga på oss.
We hope (that) you aren't angry with us. Note 'inte' before 'är' inside the clause.
English very often drops "that" ("I think it's raining"). Swedish lets you drop att in the same casual way, but the internal word order stays subordinate either way — the clause is still a bisats even when its opener is invisible.
Jag tror det regnar — du borde ta paraplyet.
I think it's raining — you should take the umbrella. 'att' is dropped, but it's still a subordinate object clause.
One clause = one element
Here is the structural insight that everything else follows from: a subordinate clause counts as a single element of the main clause. It can occupy any slot a single noun phrase could — subject, object, or the fronted first position (the fundament). When you front it, it behaves exactly like fronting any other single element: it fills first position, and the V2 rule then forces the main verb into second position immediately after it.
This produces the pattern that has no English equivalent. Front a subordinate clause, drop a comma, and the very next word is the main verb:
Eftersom det regnade, stannade vi hemma.
Because it was raining, we stayed home. The whole 'eftersom'-clause is the fundament; the main verb 'stannade' inverts to come right after the comma, before the subject 'vi'.
När jag kom hem, åt jag middag direkt.
When I got home, I ate dinner straight away. Fronted 'när'-clause → main verb 'åt' before subject 'jag'. English keeps 'I ate'; Swedish inverts to 'åt jag'.
Om du vill, kommer jag och hämtar dig.
If you want, I'll come and pick you up. 'Om du vill' is first position, so 'kommer' (not 'jag') comes after the comma.
To an English ear "Because it was raining, stayed we home" sounds wrong, because English never inverts after a fronted clause — it keeps subject-then-verb ("we stayed"). But in Swedish the fronted subordinate clause is the first element, so V2 does its job and the verb hops in front of the subject. This is the comma-then-verb signature of Swedish: a comma followed immediately by a conjugated verb is almost always a fronted subordinate clause that has triggered inversion.
Embedded relative clauses
A relative clause introduced by som ("that/which/who") embeds inside a noun phrase and modifies it. It follows the same subordinate frame — and som itself is the subordinator filling the opening slot.
Mannen som inte betalade räkningen är borta.
The man who didn't pay the bill is gone. Inside the relative clause 'som inte betalade...', the adverb 'inte' sits before the verb 'betalade'.
Jag läste boken som du alltid pratar om.
I read the book that you're always talking about. 'som du alltid pratar om' is an embedded relative; 'alltid' before 'pratar'.
When the relative clause is non-restrictive (extra information), Swedish may set it off with commas, but the internal order is unchanged. Notice that when som is the subject of its own clause it cannot be dropped, but when it is the object it often can — boken (som) du läste.
A note on commas
If you come from German, a warning: Swedish does not require a comma before att or som. German rigidly fences off every subordinate clause with commas; Swedish does not. Modern Swedish punctuation is comprehension-driven (tydlighetskommatering) — you add a comma where it aids reading, not because a clause boundary demands one. So Jag tror att det regnar takes no comma, and Boken som du läste takes none either. A comma is normal after a fronted subordinate clause (När jag kom hem, åt jag), precisely because it marks where the long first element ends and the inverted verb begins.
Common Mistakes
❌ Jag vet att hon kommer inte.
Incorrect — V2 order leaked into the subordinate clause. After 'att', the adverb goes before the verb.
✅ Jag vet att hon inte kommer.
I know that she isn't coming.
❌ Eftersom han var trött, han gick hem.
Incorrect — the fronted subordinate clause is the first element, so the main verb must invert: 'gick han', not 'han gick'.
✅ Eftersom han var trött, gick han hem.
Because he was tired, he went home.
❌ När jag kom hem, jag åt middag.
Incorrect — no inversion. The fronted 'när'-clause forces the verb before the subject.
✅ När jag kom hem, åt jag middag.
When I got home, I ate dinner.
❌ Mannen som betalade inte räkningen...
Incorrect — inside the relative clause, 'inte' belongs before the verb, not after it.
✅ Mannen som inte betalade räkningen...
The man who didn't pay the bill...
❌ Jag hoppas, att du mår bra.
Incorrect — Swedish does not require a comma before 'att' (unlike German).
✅ Jag hoppas att du mår bra.
I hope you're well.
Key Takeaways
- A subordinate clause uses a fixed frame: subordinator – subject – sentence adverb – finite verb – rest. The V2 rule is off.
- The headline of the BIFF rule: inte and other sentence adverbs come before the finite verb (att hon inte kommer), the reverse of main-clause order (hon kommer inte).
- A whole subordinate clause counts as one element and can fill the main-clause first position.
- A fronted subordinate clause triggers inversion of the main verb right after the comma — När jag kom hem, åt jag — the comma-then-verb pattern English never produces.
- No comma is required before att or som (unlike German); a comma after a fronted subordinate clause is normal.
Now practice Swedish
Reading grammar gets you part of the way. The exercises are where it sticks — free, no signup needed.
Start learning Swedish→Related Topics
- The BIFF Rule (Subordinate Clause Order)B1 — Subordinate clauses do NOT have V2. The order is conjunction + subject + sentence-adverb + finite verb, so the sentence adverb (especially 'inte') comes BEFORE the verb — the exact opposite of a main clause, where 'inte' follows it. The mnemonic BIFF stands for 'I Bisats kommer Inte Före Finita verbet' — in a subordinate clause, 'inte' comes before the finite verb. The single diagnostic for clause type is where 'inte' sits: after the verb = main, before the verb = subordinate.
- Subordinating Conjunctions (att, om, när, eftersom)B1 — The words that open a subordinate clause and force it into BIFF order: att (that), om (if/whether), när (when), då (when/since), eftersom and därför att (because), fast/fastän (although), medan (while), innan (before), sedan (after/since), så att (so that). All of them push the sentence adverb — especially 'inte' — to BEFORE the finite verb. Two notorious pairs to get right: när vs då, and the subordinator därför att (because, BIFF) vs the adverb därför (therefore, main-clause inversion).
- att-ClausesB1 — att is the complementizer 'that' — the word that turns a clause into the object or subject of a verb (Jag vet att han kommer). Like English 'that', it can be dropped after common verbs of saying and thinking (Jag tror (att) han sover), but the subordinate BIFF order STAYS even when att disappears. Inside an att-clause 'inte' sits before the verb. Keep att (complementizer) firmly distinct from och (and) and from infinitive-marker att.
- Clause Linking: Coordination vs SubordinationB1 — There are exactly two ways to glue clauses together in Swedish, and the choice leaves a VISIBLE fingerprint on word order. Coordination (och, men, eller, så, för) joins EQUAL clauses and each one keeps plain main-clause V2 order. Subordination (att, om, när, eftersom, fast) makes one clause DEPENDENT, switching it to BIFF order — and that whole subordinate clause can be fronted into the main clause's first slot, forcing the main verb to invert. So clause-linking and word order are the same topic seen from two angles.