Causal clauses in German: weil, da and denn — word order and difference
weil and da send the verb to the end, denn keeps it in second place; weil gives a new reason, da a known one, denn never precedes its statement.
Rule
German has three words for "because". They differ in word order, not in meaning: weil and da push the conjugated verb to the end of their clause, while denn leaves it in second position.
- weil — the default: a new reason, the information the listener is asking for. Only weil can answer Warum? on its own: Warum kommst du nicht? — Weil ich arbeiten muss.
- da — the reason is already known or easy to guess, so the clause presents it as background; da sounds more formal and is frequent in writing.
- denn — the same reason, a different structure: what follows denn is a complete main clause, so the verb stays in second position.
Where the clause stands. A weil- or da-clause may follow the main clause or come first. Fronted, it fills position 1, so the main clause begins with its conjugated verb: Weil ich krank bin, bleibe ich zu Hause. The da-clause usually comes first but can also follow; a denn-clause never precedes the statement it explains. A comma is required before all three.
Inside a weil- or da-clause the conjugated verb is last: the modal (weil ich arbeiten muss), haben/sein in the Perfekt (weil ich zu viel gegessen habe), and a separable verb stays whole (weil der Film um acht anfängt).
deshalb, darum, daher (and deswegen) are adverbs, not conjunctions: they introduce the consequence, and they fill position 1, so the subject follows the verb: Ich bin krank. Deshalb bleibe ich zu Hause.
In casual speech weil often takes the verb in second position (weil ich bin müde), like denn — spoken language only; in writing and in exams the verb belongs at the end.
Examples
- Ich bleibe heute zu Hause, weil ich krank bin. — I'm staying at home today because I'm ill.
- Weil das Wetter schlecht ist, fahren wir mit dem Bus. — Because the weather is bad, we're taking the bus.
- Warum lernst du so viel? — Weil ich morgen eine Prüfung habe. — Why are you studying so much? — Because I have an exam tomorrow.
- Ich kann heute nicht kommen, weil ich länger arbeiten muss. — I can't come today because I have to work longer.
- Da du schon hier bist, können wir gleich anfangen. — Since you're already here, we can start right away.
- Da der Zug Verspätung hatte, sind wir zu spät gekommen. — Since the train was delayed, we arrived too late.
- Ich nehme das Fahrrad, denn der Bus fährt heute nicht. — I'm taking the bike, because the bus isn't running today.
- Wir müssen uns beeilen, denn der Film fängt um acht an. — We have to hurry, because the film starts at eight.
- Der Bus fährt heute nicht. Deshalb nehme ich das Fahrrad. — The bus isn't running today. That's why I'm taking the bike.
Quick table
| Connector | Type | Conjugated verb | Clause first? | Comma | Typical use |
|---|---|---|---|---|---|
| weil | subordinating | at the end of its clause | yes — the main clause then starts with the verb | required | new reason; answers Warum? on its own |
| da | subordinating | at the end of its clause | yes — and it usually does | required | reason already known; more formal, written |
| denn | coordinating (position 0) | second position, no inversion | no — it always follows its statement | required | reason added as a second main clause |
| Structure | Sentence |
|---|---|
| weil, reason second | Ich bleibe zu Hause, weil ich krank bin. |
| weil, reason first | Weil ich krank bin, bleibe ich zu Hause. |
| da, known reason | Da ich krank bin, bleibe ich zu Hause. |
| denn, reason always after | Ich bleibe zu Hause, denn ich bin krank. |
| deshalb, consequence | Ich bin krank. Deshalb bleibe ich zu Hause. |
Common mistakes
- ❌ Ich bleibe zu Hause, weil ich bin krank. → ✅ Ich bleibe zu Hause, weil ich krank bin. — after weil the conjugated verb belongs at the end; verb-second is casual speech only.
- ❌ Weil ich krank bin, ich bleibe zu Hause. → ✅ Weil ich krank bin, bleibe ich zu Hause. — the fronted clause fills position 1, so the main clause starts with its verb.
- ❌ Ich nehme das Fahrrad, denn fährt der Bus heute nicht. → ✅ Ich nehme das Fahrrad, denn der Bus fährt heute nicht. — denn sits in position 0, does not count as a sentence element and moves nothing.
- ❌ Denn der Bus heute nicht fährt, nehme ich das Fahrrad. → ✅ Weil der Bus heute nicht fährt, nehme ich das Fahrrad. — denn never precedes the statement it explains and never sends the verb to the end; use weil or da.
- ❌ Ich bin krank, deshalb ich bleibe zu Hause. → ✅ Ich bin krank, deshalb bleibe ich zu Hause. — deshalb is an adverb in position 1, so the subject follows the verb.
Related
weil and da follow the same verb-final pattern as dass, wenn and ob; denn behaves like und, aber and oder.
Frequently asked questions
What is the difference between weil, da and denn?
All three give a reason. weil and da send the conjugated verb to the end of their clause, denn leaves it in second position. weil introduces a new reason, da one the listener already knows, and denn simply adds the reason as a second main clause.
Where does the verb go after weil?
At the end of the weil-clause: Ich bleibe zu Hause, weil ich krank bin. If the weil-clause comes first, it fills position 1 and the main clause starts with its conjugated verb: Weil ich krank bin, bleibe ich zu Hause.
Can a German sentence begin with denn?
Only when it points back to what was just said: Ich nehme das Fahrrad. Denn der Bus fährt heute nicht. denn never precedes the statement it explains, so the reason cannot be fronted with it — for that use weil or da: Weil ich krank bin, bleibe ich zu Hause.
Is weil ich bin müde wrong?
In written and formal German, yes: the standard form is weil ich müde bin. Verb-second after weil is common in casual speech, where it works like denn, but it does not belong in writing or in an exam.
Is deshalb the same as weil?
No. weil introduces the reason, deshalb (also darum, daher, deswegen) introduces the consequence. It is an adverb in position 1, so the subject follows the verb: Ich bin krank. Deshalb bleibe ich zu Hause.