In English, "because," "but," and "although" are just connecting words; they do not change anything about the clauses they join. In German, the type of conjunction you choose is a syntactic command. Coordinating conjunctions leave word order completely alone. Subordinating conjunctions reach into the clause and drag the finite verb to the end. Picking the wrong type does not just sound slightly off — it produces a sentence that is grammatically broken. This page is about telling the two classes apart and the famous denn-versus-weil trap that proves the distinction is real.
Two classes, two behaviors
A coordinating conjunction joins two elements of equal rank — typically two full main clauses. It sits between them in a position called "position zero," because it does not count as part of either clause. The clause after it keeps its normal verb-second order, exactly as if it stood alone.
A subordinating conjunction introduces a dependent clause and counts as the first element of that clause. It forces the finite verb to the end (covered in depth on the verb-final page).
| Coordinating | Subordinating | |
|---|---|---|
| Members | und, oder, aber, denn, sondern (the "ADUSO" set) | weil, dass, wenn, obwohl, ob, als, während, damit, ... |
| Position | "Position zero" — between the clauses | First element of its own clause |
| Word order of the clause | Unchanged — stays V2 | Finite verb goes to the end |
| Rank of the clauses | Equal (both main clauses) | One depends on the other |
The memory hook ADUSO captures the five coordinators: Aber, Denn, Und, Sondern, Oder. If a conjunction is on that list, it never touches the word order. If it is not, assume it sends the verb to the end.
Coordinating: word order stays put
After und, oder, aber, denn, or sondern, the following clause behaves like a normal main clause — subject, then finite verb in second position.
Ich bin müde, aber ich arbeite weiter.
I'm tired, but I'm carrying on working. (after 'aber': subject 'ich', then V2 verb 'arbeite')
Wir können ins Kino gehen, oder wir bleiben zu Hause.
We can go to the cinema, or we'll stay home. ('oder' joins two V2 clauses)
Sie hat nicht angerufen, sondern sie ist einfach gekommen.
She didn't call; instead she just showed up. ('sondern' leaves V2 intact)
Notice that in each case the second clause could stand on its own as a complete sentence. The coordinator simply links two equals and stays out of their internal grammar.
Subordinating: the verb goes to the end
Swap in a subordinator and the picture changes completely. The clause it introduces is now dependent, and its finite verb drops to the back.
Ich arbeite weiter, obwohl ich müde bin.
I'm carrying on working although I'm tired. ('obwohl' sends 'bin' to the end)
Wir bleiben zu Hause, wenn es regnet.
We'll stay home if it rains. ('wenn' pushes 'regnet' to the end)
The same idea — "I keep working; I'm tired" — can be expressed with either class, but the word order is dictated entirely by which conjunction you pick. aber (coordinating) keeps ich bin müde; obwohl (subordinating) requires ich müde bin.
The decisive pair: denn vs weil
Nothing illustrates the two classes more sharply than denn and weil. Both translate "because." Both give a reason. Yet they belong to opposite syntactic camps, and they demand opposite word orders.
- denn is coordinating (it is the "D" in ADUSO) → the clause keeps V2.
- weil is subordinating → the verb goes to the end.
Ich bleibe zu Hause, denn ich bin müde.
I'm staying home, because I'm tired. (denn = coordinating: subject 'ich', then V2 verb 'bin')
Ich bleibe zu Hause, weil ich müde bin.
I'm staying home because I'm tired. (weil = subordinating: 'bin' moves to the end)
Read those two side by side. Same meaning, same words in the second clause — only the conjunction and the verb's position differ. denn ich *bin müde keeps the verb second; weil ich müde *bin sends it last. Get the pairing backwards (denn ich müde bin or weil ich bin müde) and the sentence is wrong.
There is a third "because" word worth flagging: da ("since, as"), which is subordinating like weil and also sends the verb to the end (Da ich müde *bin, bleibe ich zu Hause — formal/written). So of the three causal words, only *denn keeps V2; weil and da are verb-final.
A warning about conjunctional adverbs
Some connectors look like conjunctions but are actually adverbs — words like deshalb ("therefore"), trotzdem ("nevertheless"), dann ("then"), außerdem ("besides"). These count as the first element of their clause, so they trigger V2 inversion: the finite verb comes second and the subject moves after it. They are neither coordinating (position zero) nor subordinating (verb-final) — a third pattern.
Ich bin müde, deshalb bleibe ich zu Hause.
I'm tired, therefore I'm staying home. ('deshalb' fills the front field; 'bleibe' is second, subject after)
Es hat geregnet, trotzdem sind wir spazieren gegangen.
It rained; we went for a walk anyway. ('trotzdem' forces inversion: verb second, subject after)
Do not lump these in with coordinators. deshalb is not denn; it occupies the Vorfeld and inverts the subject.
Why the distinction matters structurally
The two classes encode two different relationships. Coordination joins clauses that are equal partners — neither is grammatically inside the other — so each keeps its own independent V2 grammar. Subordination embeds one clause inside another, and German marks that embedding by reshaping the embedded clause: conjunction at the front, finite verb at the back, forming a frame the listener can recognize. The word order is not decoration; it is how German signals "this clause is part of that one" versus "these two clauses are side by side." English collapses both relationships into the same flat word order and relies on the conjunction's meaning alone. German makes the structure visible.
Common Mistakes
Using verb-final order after denn — treating the coordinator like weil.
❌ Ich bleibe zu Hause, denn ich müde bin.
Incorrect — 'denn' is coordinating; the verb must stay in second position.
✅ Ich bleibe zu Hause, denn ich bin müde.
I'm staying home, because I'm tired.
Using V2 order after weil — the mirror error, extremely common in speech.
❌ Ich bleibe zu Hause, weil ich bin müde.
Incorrect — 'weil' is subordinating; the verb goes to the end.
✅ Ich bleibe zu Hause, weil ich müde bin.
I'm staying home because I'm tired.
Treating deshalb / trotzdem like a coordinator — forgetting the inversion.
❌ Es war spät, trotzdem wir sind geblieben.
Incorrect — 'trotzdem' is an adverb in the front field and forces verb-second: 'sind wir geblieben.'
✅ Es war spät, trotzdem sind wir geblieben.
It was late; we stayed anyway.
Forgetting the comma before aber, sondern, denn, and all subordinators (while und and oder usually take none).
❌ Ich wollte kommen aber ich hatte keine Zeit.
Incorrect — a comma is required before 'aber.'
✅ Ich wollte kommen, aber ich hatte keine Zeit.
I wanted to come, but I didn't have time.
Key Takeaways
- Coordinating conjunctions (the ADUSO set: aber, denn, und, sondern, oder) sit in "position zero" and leave the following clause in V2 order.
- Subordinating conjunctions (weil, dass, wenn, obwohl, ...) count as the clause's first element and send the finite verb to the end.
- denn (coordinating, V2) and weil (subordinating, verb-final) both mean "because" but demand opposite word orders — the conjunction dictates the grammar.
- Conjunctional adverbs (deshalb, trotzdem, dann) are a third type: they fill the front field and force verb-second inversion.
- Put a comma before aber, sondern, denn, and every subordinator; und and oder usually take none.
Now practice German
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Start learning German→Related Topics
- Verb-Final Order in Subordinate ClausesB1 — Why a subordinating conjunction sends the finite verb to the very end of the clause — and why in compound tenses the auxiliary lands dead last.
- Coordinating Conjunctions (und, aber, oder, denn, sondern)A1 — The five coordinating conjunctions — und, aber, oder, denn, sondern — link two equal main clauses without touching the word order: the verb stays in second position in both.
- Causal Conjunctions: weil, da, dennB1 — German has three words for 'because' — weil, da, and denn — and they differ in both syntax (verb-final vs V2) and discourse (new vs known reason). Here's how to choose.
- denn in QuestionsB1 — The particle denn turns a bald question into a warm, engaged one — and why it must not be confused with the conjunction denn ('because').
- Verb-Second (V2): The Core Rule of German Word OrderA1 — The finite verb is always the second element in a German main clause — exactly one constituent precedes it, and the subject jumps behind the verb whenever something else is fronted.
- Subordinating Conjunctions: OverviewB1 — Every subordinating conjunction — dass, weil, wenn, obwohl, damit and the rest — does the same thing: it sends the finite verb to the end of its clause. Learn the list, and the syntax becomes automatic.