Cause and Reason: fordi, siden, ettersom, for

To say why something happens, Norwegian gives you a small family of conjunctions: fordi, siden, ettersom, the more formal causal da, and — looking almost identical in meaning but behaving completely differently in syntax — the coordinating for. English collapses most of these into one word, because. The real lesson of this page is that Norwegian splits the job of because across two grammatical categories — a subordinating branch (fordi, siden, ettersom, da) and a coordinating branch (for) — and the two branches obey different word-order rules. Sort the syntax and the meanings are easy.

fordi — the neutral default

fordi is the workhorse. It is the direct, neutral because, the one you reach for when you simply want to give a reason. It answers the question hvorfor? (why?). Like every subordinator, it triggers subordinate word order — so ikke lands before the finite verb.

Look at fordi vi ikke hadde — adverb before verb, the subordinate order. An English speaker, whose because-clause keeps ordinary word order ("because we didn't have"), is tempted to write fordi vi hadde ikke — and that is wrong.

fordi as a stand-alone answer to "why?"

When someone asks Hvorfor?, English lets you answer with a bare "Because." In careful Norwegian, fordi wants a full clause after it — it is a conjunction, not a complete answer on its own. In casual speech a bare "Fordi!" (the equivalent of a stubborn "Because!") does occur, but it sounds childish or evasive. The expected answer is the whole clause:

fordi can be fronted — and then the main clause inverts

A fordi-clause normally follows the main clause, but you can move it to the front for emphasis. When you do, the fordi-clause fills the opening slot (the fundament) of the sentence, which forces the main verb to invert and come before its subject — a classic stacking of two rules. See inversion for the general pattern.

Trace it: Fordi det regnet (the subordinate clause fills the fundament), then ble vi (verb before subject in the main clause). English keeps "we stayed home" in subject-verb order, so English speakers tend to write the ungrammatical ...vi ble hjemme.

Here both rules fire at once: fordi vi ikke hadde (subordinate order, ikke before verb) and then hadde vi (main-clause inversion).

siden — since / seeing as

siden means since in the causal sense — "given that," "seeing as." It tends to introduce a reason the listener already knows or accepts, often a reason you front. (It also has a temporal since sense, covered on the time conjunctions page; context separates them.)

Note the subordinate order in siden vi ikke har. siden very naturally sits at the front of the sentence, again triggering main-clause inversion: Siden du spør, *skal jeg...*

ettersom — as / since

ettersom is close to siden in meaning — as, since, given that — but feels a shade more formal and explanatory. It is common in writing and measured speech.

da — causal "as" (formal, written)

Beyond its temporal "single past" sense, da can also mean causal as / since — but this use is formal and largely written (academic, legal, literary). In everyday speech you would use siden or fordi. Learners should recognise it but rarely need to produce it.

for — the coordinating look-alike

Here is the trap. for also translates as for / because, and in meaning it overlaps heavily with fordi. But for is a coordinating conjunction, not a subordinating one. That difference has two concrete consequences:

1. The clause after for keeps main-clause word order — so ikke comes after the verb (for jeg hadde ikke tid), not before it.
2. for is immobile: it cannot be fronted. You can never start a sentence with a for-clause the way you can with fordi or siden.

Compare the word order directly. After coordinating for: for han hadde jobbet (verb keeps its normal slot). After subordinating fordi: fordi han hadde jobbet looks the same here — but add a negation and the two split apart:

That contrast — for han hadde ikke versus fordi han ikke hadde — is the whole point. Same English because, two different Norwegian word orders depending on which conjunction you chose. for also feels a little more literary/written than fordi in many contexts, and it always needs a comma before it.

See coordinating conjunctions for the full coordinating set (og, men, eller, for, så) and the rule that they all keep main-clause order.

Common Mistakes

After fordi the order is jeg ikke var, not jeg var ikke. English keeps the same order in both clauses, so this transfers wrongly.

You cannot front a for-clause. To lead with the reason, use fordi (or siden).

The mirror trap: with fordi it must be ikke hadde, not hadde ikke (the latter belongs to coordinating for).

The fronted clause fills the fundament, so the main verb ble must come before vi.

Key Takeaways

• fordi = the neutral because; it answers hvorfor? and triggers subordinate order (fordi jeg ikke kom).
• A fordi-clause can be fronted, and then the main clause inverts (Fordi..., ble vi...).
• siden and ettersom = since / as; both are subordinating and frontable.
• Causal da = as / since but is formal and written — avoid it in everyday speech.
• for is coordinating: it keeps main-clause order (for jeg hadde ikke tid) and can never be fronted.
• The same English because splits by syntax: fordi jeg ikke hadde vs for jeg hadde ikke.