When you want to say "and so / therefore / as a result," Danish hands you a family of result adverbs: derfor, således, dermed, derved, af den grund. They all share one grammatical feature that English does not warn you about — because they are adverbs, they trigger V2 inversion when they open a sentence (Derfor gik jeg, not Derfor jeg gik). This sets them apart from the subordinator fordi (because), which builds a completely different word order. Mastering this contrast is the single most valuable thing on this page.
derfor — the everyday "therefore / so"
Derfor is the workhorse result connective: "therefore, that's why, so." It is an adverb, and when fronted (its most common position) it takes the first slot, forcing the verb into second place ahead of the subject — inversion. See the general rule at syntax/v2-rule.
Jeg var syg. Derfor blev jeg hjemme.
I was sick. Therefore I stayed home.
Bussen var aflyst, og derfor kom vi for sent.
The bus was cancelled, and so we arrived late.
In both, the verb (blev, kom) sits right after derfor, before the subject. The instinct to write Derfor jeg blev hjemme — keeping English subject–verb order — is the error to root out.
The crux: derfor (adverb) vs. fordi (subordinator)
This is the heart of the page. Danish expresses the cause–result relationship from two directions, and the two words behave oppositely:
- fordi (because) introduces the cause and is a subordinator → subordinate word order (the clause is dependent; sentence adverbs go before the verb). See conjunctions/subordinating-cause.
- derfor (therefore) introduces the result and is an adverb → main-clause V2 with inversion when fronted.
Jeg blev hjemme, fordi jeg var syg.
I stayed home because I was sick. (fordi → subordinate order)
Jeg var syg. Derfor blev jeg hjemme.
I was sick. Therefore I stayed home. (derfor → V2 inversion)
Same facts, opposite grammar. Fordi points back to the reason and builds a subordinate clause; derfor points forward to the consequence and builds an inverting main clause. You can even see it in the negation test: in a fordi-clause, ikke comes before the verb (fordi jeg ikke var syg), whereas after fronted derfor the verb leads (Derfor var jeg ikke...).
The full result set
| Word | Meaning | Position | Register |
|---|---|---|---|
| derfor | therefore, so, that's why | adverb; inverts when fronted | neutral |
| således | thus, in this way / and so | adverb; inverts when fronted | formal / written |
| dermed | thereby, with that, and so | adverb; inverts when fronted | neutral–formal |
| derved | thereby, by that means | adverb; inverts when fronted | formal |
| af den grund | for that reason | adverbial phrase; inverts when fronted | neutral–formal |
| som følge heraf | as a consequence (of this) | adverbial phrase; inverts when fronted | formal / written |
| så | so, and so | coordinator-like; no inversion | informal–neutral |
således — formal "thus"
Således means "thus / in this way" and is heavily used in formal and academic prose to draw a conclusion. Like derfor, it inverts when fronted.
Tallene faldt hvert år. Således kunne vi forudse krisen.
The figures fell every year. Thus we could foresee the crisis.
dermed and derved — "thereby"
Dermed ("thereby / with that / and so") often marks that one action automatically completes or enables another. Derved is its more formal twin, stressing the means.
Hun underskrev kontrakten. Dermed var aftalen endelig.
She signed the contract. With that, the agreement was final.
Vi sænkede temperaturen og sparede derved energi.
We lowered the temperature and thereby saved energy.
af den grund and som følge heraf — phrasal results
These phrasal connectives are common in writing. Both invert when fronted, just like single-word adverbs, because the whole phrase fills the first slot.
Vejret var farligt. Af den grund aflyste de kampen.
The weather was dangerous. For that reason they cancelled the match.
Eksporten stoppede. Som følge heraf steg priserne.
Exports stopped. As a consequence, prices rose.
så — the casual "so"
In speech, the everyday way to express result is så ("so"), which behaves more like a coordinator and does not trigger inversion — the subject follows directly.
Jeg var træt, så jeg gik i seng.
I was tired, so I went to bed.
This is why beginners reach for så: it's safe word-order-wise. But in writing, derfor and således read as more precise and more adult.
Putting several together
A connected stretch showing the family at work:
Maskinen var gammel og brød ofte sammen. Derfor besluttede vi at udskifte den. Den nye model bruger mindre strøm og sænker dermed udgifterne. Således tjener investeringen sig hjem på to år.
The machine was old and often broke down. Therefore we decided to replace it. The new model uses less power and thereby lowers the costs. Thus the investment pays for itself in two years.
Every result connective here inverts its verb: Derfor besluttede vi, sænker dermed (mid-clause), Således tjener investeringen.
Common Mistakes
1. No inversion after fronted derfor (the signature English-speaker error).
❌ Derfor jeg gik hjem.
Incorrect — derfor is an adverb; the verb must be second.
✅ Derfor gik jeg hjem.
Therefore I went home.
2. No inversion after fronted således / af den grund.
❌ Således vi kunne forudse krisen.
Incorrect — fronted adverb requires verb-second order.
✅ Således kunne vi forudse krisen.
Thus we could foresee the crisis.
3. Using derfor to mean fordi — pointing the wrong direction.
❌ Jeg blev hjemme, derfor jeg var syg.
Incorrect — derfor means 'therefore', not 'because'; this needs fordi.
✅ Jeg blev hjemme, fordi jeg var syg.
I stayed home because I was sick.
4. Applying subordinate order to a derfor-clause (treating it like fordi).
❌ Derfor jeg ikke gik.
Incorrect — that is fordi-style order; derfor needs V2: verb before ikke.
✅ Derfor gik jeg ikke.
Therefore I didn't go.
Key takeaways
- derfor, således, dermed, derved, af den grund, som følge heraf are adverbs → they invert the verb when fronted.
- fordi is a subordinator → subordinate word order, pointing back to the cause. Opposite grammar from derfor.
- The casual så ("so") behaves like a coordinator and does not invert — handy in speech, less precise in writing.
- For the full picture of expressing cause and reason, see sentences/cause-reason; for contrast connectives, see discourse/adversative.
Now practice Danish
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Start learning Danish→Related Topics
- Discourse Markers: An OverviewB1 — How Danish connectives structure text and argument — and the crucial word-order split between adverbs, coordinators, and subordinators.
- Adversative ConnectivesB1 — Danish words for contrast and concession — men, dog, alligevel, derimod — and the crucial split between the coordinator men and contrast adverbs that trigger inversion.
- Conjunctions of Cause and Reason: Fordi, Da, EftersomA2 — How to give reasons in Danish — fordi for the default 'because', da and eftersom for a known reason, and how they differ from the coordinating for.
- Giving ReasonsA2 — Build Danish reason sentences with fordi, for, derfor, and da — and the different word order each one triggers.
- The V2 Rule: Verb SecondA1 — The core rule of Danish main clauses: the finite verb stands in second position, with exactly one constituent before it — and the subject inverts when anything else is fronted.