The V2 rule says the finite verb stands second in a main clause — fronting anything inverts verb and subject. Inside a subordinate clause, that machinery is largely switched off, and the resulting word order is the single clearest signal that you've left the main clause and entered an embedded one. The defining contrast is the position of ekki and sentence adverbs: in a main clause the verb comes before them (hann kemur ekki); in a subordinate clause they can come before the verb (… að hann ekki kemur). This "negation-position flip" is your diagnostic of clause type. We'll also meet the one important exception — embedded V2 after verbs of saying and thinking — which explains apparent V2 inside some að-clauses.
V2 is suspended: subject stays next to the subordinator
In a main clause you can front a non-subject and the verb jumps to second place (Í dag fer ég). In a subordinate clause you can't do that. The subordinator (að, ef, þegar, sem…) already occupies the front edge of the clause, the subject comes right after it, and the finite verb stays in its base position deeper in the clause. There is no slot to front into and no inversion.
Ég veit að hún kemur á morgun.
I know that she's coming tomorrow. — subordinator að, then subject hún, then verb kemur. No inversion.
Hann fór út þegar síminn hringdi.
He went out when the phone rang. — þegar + subject síminn + verb hringdi.
Þetta er maðurinn sem ég talaði við.
This is the man I spoke to. — relative sem + subject ég + verb talaði.
Compare what you'd do in a main clause: Á morgun kemur hún (V2, inverted). Embed the same idea under að and the inversion vanishes: … að hún kemur á morgun. You cannot say … að á morgun kemur hún in the neutral case — fronting á morgun and inverting is a main-clause move, and the subordinate clause doesn't allow it (with the marked exception below). The subject stays glued to the subordinator.
The negation-position flip: the diagnostic of clause type
The most reliable sign of a subordinate clause is where the sentence adverbs and ekki sit relative to the finite verb. In a main clause they follow the verb. In a subordinate clause — especially in careful or written style — they precede it.
| Clause type | Order |
|---|---|
| Main | Hún kemur ekki. (verb before ekki) |
| Subordinate (colloquial) | … að hún kemur ekki. |
| Subordinate (conservative) | … að hún ekki kemur. |
Ég veit að hún kemur ekki.
I know she's not coming. — everyday order: verb kemur, then ekki.
… enda þótt hún ekki kæmi.
… even though she did not come. — conservative/formal: ekki before the verb kæmi (literary register).
Hann sagðist ekki hafa séð neitt.
He said he hadn't seen anything. — subordinate (here as infinitival report); ekki precedes the verb cluster.
Both subordinate orders are correct; they differ in register. The pre-verbal ekki (… að hún ekki kemur / kæmi) belongs to careful, formal, and literary Icelandic; the post-verbal ekki (… að hún kemur ekki) dominates ordinary speech. What matters is that the possibility of pre-verbal ekki exists only in subordinate clauses. If you can move ekki in front of the finite verb without the sentence breaking, you are inside a subordinate clause; if doing so is impossible, you're in a main clause.
A because-clause, worked through
Causal af því að / því að clauses are a good place to feel both registers. The clause is subordinate, so the subject follows the conjunction and ekki may go either side of the verb depending on how formal you're being.
Ég fór snemma af því að ég var þreyttur.
I left early because I was tired. — af því að + subject ég + verb var. Subordinate, no inversion.
Hann svaraði ekki, því að hann hafði ekki heyrt spurninguna.
He didn't answer, because he hadn't heard the question. — því að-clause; colloquial post-verbal ekki (hafði ekki heyrt).
Notice that in the second clause ekki sits between the auxiliary hafði and the supine heyrt — the compound-verb position. That spot is stable across clause types; the register variation is mainly about simple (single-verb) clauses.
Embedded V2: the marked exception
Here's the wrinkle that confuses learners who've just learned "no V2 in subordinate clauses." After bridge verbs — verbs of saying, thinking, believing, knowing (segja, halda, telja, vita, finnast) — Icelandic allows a marked option where the embedded að-clause does show V2: you can front something inside it and invert the verb, just like a main clause. This is "embedded V2" (or embedded topicalization). It is not the neutral order, but it is real and common, and it explains apparent V2 inside some að-clauses.
Hann segir að á morgun fari hann til útlanda.
He says that tomorrow he's going abroad. — embedded V2: inside the að-clause, á morgun is fronted and fari hann inverts.
Hún heldur að þetta hafi hann aldrei séð.
She thinks that he has never seen this. — embedded V2: object þetta fronted, hafi hann inverted, inside the að-clause.
Hann sagði að þetta hefði hann aldrei gert.
He said that he would never have done this. — embedded V2 after segja: þetta fronted, hefði hann inverted.
What licenses this? Two conditions, roughly: the matrix verb has to be a bridge verb (asserting a proposition — say, think, believe), and the embedded clause has to be asserted, not presupposed. You'll see embedded V2 after Hann segir að… ("he says that…") but not after Það er skrýtið að… ("it's strange that…"), where the content is presupposed. So the two orders coexist: the neutral að hann fer á morgun and the marked, V2 að á morgun fer hann — the latter foregrounding á morgun.
This is why you'll sometimes see what looks like a verb in second position inside an að-clause and wonder whether the no-V2 rule was wrong. It wasn't: ordinary subordinate clauses suspend V2, but bridge-verb complements can optionally re-enable it. Recognising embedded V2 as a separate, marked construction keeps both facts straight.
Common Mistakes
❌ Ég veit að á morgun kemur hún (as a neutral statement).
Over-applied V2 — neutral subordinate order keeps the subject after að: að hún kemur á morgun. (Embedded V2 is a marked option, not the default.)
✅ Ég veit að hún kemur á morgun.
I know she's coming tomorrow. — subject hún right after að; no inversion in the neutral case.
The commonest error is importing main-clause V2 into an ordinary subordinate clause. Keep the subject next to the subordinator unless you're deliberately using marked embedded V2 after a bridge verb.
❌ Hann segir að hann fer ekki, og inverti eins og í aðalsetningu.
Confusion of orders — a plain reported að-clause keeps subordinate order; don't force main-clause inversion.
✅ Hann segir að hann fari ekki.
He says he's not going. — neutral subordinate order: subject hann, then verb fari, then ekki.
A reported að-clause defaults to subordinate order. Embedded V2 is available, but it requires fronting something for emphasis — it's not automatic just because there's a verb of saying.
❌ Ég held að ekki hann komi.
Misplaced negation — ekki goes around the verb, not before the subject.
✅ Ég held að hann komi ekki.
I don't think he's coming. — colloquial: subject hann, verb komi, then ekki. (Careful style: að hann ekki komi.)
ekki attaches to the finite verb's region (before or after it), never in front of the subject. The subject stays adjacent to the subordinator.
❌ Þetta er bókin að ég keypti í gær.
Wrong linker — a relative clause uses sem (or a bare gap), not að.
✅ Þetta er bókin sem ég keypti í gær.
This is the book I bought yesterday. — relative sem; still subordinate order (subject ég after sem).
Key Takeaways
- In a subordinate clause, V2 is suspended: the subject stays right after the subordinator and the finite verb does not invert.
- The negation-position flip is the diagnostic of clause type: main clauses have verb + ekki; subordinate clauses allow ekki + verb (… að hann ekki kemur), especially in careful/formal style.
- Both subordinate orders are correct and differ in register: pre-verbal ekki is conservative/literary, post-verbal ekki is everyday speech.
- Embedded V2 is a marked exception: after bridge verbs (segja, halda, telja), an asserted að-clause can show V2 — … að *á morgun fer hann* — which explains apparent V2 inside some að-clauses.
- Don't import neutral main-clause V2 into ordinary subordinate clauses, and don't confuse the relative linker sem with the complementiser að.
Now practice Icelandic
Reading grammar gets you part of the way. The exercises are where it sticks — free, no signup needed.
Start learning Icelandic→Related Topics
- V2: The Verb-Second RuleA2 — The foundational rule of Icelandic main clauses — the finite verb is always the SECOND constituent, so fronting anything other than the subject forces verb-subject inversion (Í dag fer ég, Þetta veit ég ekki), unlike English which keeps the subject first.
- Subordinating Conjunctions and Word OrderB1 — The main subordinators — að, ef, þegar, meðan, af því að, þótt, áður en, eftir að, þangað til, nema — and the two word-order effects they trigger: a subordinate clause loses V2 (ekki/sentence adverbs come before the finite verb), and a fronted subordinate clause inverts the following main clause.
- Where Negation Goes: Main vs SubordinateB1 — A placement drill for ekki and sentence adverbs across clause types — after the finite verb in main clauses (hann kemur ekki), before it in careful subordinate clauses (... að hann ekki komi), and between auxiliary and main verb in compound tenses (hann hefur ekki komið).
- Embedded V2 and Bridge VerbsC1 — Icelandic is a symmetric-V2 language: unlike English or Mainland Scandinavian, the verb-second rule holds even inside subordinate að-clauses, so you can topicalize within them and invert (Ég veit að á morgun fer Jón; Hann sagði að þessa bók hefði María lesið). Embedded V2 is licensed by ASSERTIVE bridge verbs (segja, halda, telja, vita) and correlates with the indicative — so word order, mood, and the speaker's commitment to the embedded proposition all move together.
- Subjunctive in Reported SpeechB1 — The single most frequent subjunctive trigger in Icelandic: indirect speech introduced by að (and hvort/wh-words) after verbs of saying, thinking, hoping, and asking. The reported clause goes into the subjunctive to mark that the content is REPORTED, not asserted — present subjunctive (sé, komi, fari) under a present matrix verb, past subjunctive (væri, kæmi, færi) under a past one (backshift). Indicative can creep in for facts the speaker personally vouches for, making the mood a subtle evidentiality device.