because
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because
Introduces a main clause that provides a reason or explanation for the preceding main clause. The word order in the sentence does not change.
Ich kann heute nicht kommen, denn ich bin krank.
I can't come today because I am sick.
then
Used as a particle in questions to express interest, surprise, or impatience and to make the question sound friendlier or more informal.
Wo warst du denn so lange?
Where have you been for so long, then?
Whether 'denn' (because/then) is a reason-giving conjunction or a particle can be recognized easily from the sentence type. In a statement, it gives a reason. In a question, it is a particle that expresses interest or surprise.
Ich gehe jetzt, denn ich bin müde.
I'm going now because I'm tired.
'Denn' (because) introduces a main clause that provides a reason. Unlike other reason-giving conjunctions, 'denn' does not change the word order: the verb remains in position 2.
Er bleibt zu Hause, denn er fühlt sich nicht gut.
He is staying at home because he doesn't feel well.
As a particle in a question, 'denn' usually stands directly after the question word and the verb. It makes the question friendlier or expresses curiosity and is often not translated literally.
Was machst du denn hier?
What are you doing here?
because
Denn and weil both give a reason. After denn, a main clause follows with normal word order, while weil introduces a subordinate clause and usually places the verb at the end. Use denn to join two main clauses and weil for an embedded reason.
Ich bleibe zu Hause, denn ich bin krank.
I’m staying home because I’m sick.
Ich bleibe zu Hause, weil ich krank bin.
I’m staying home because I’m sick.
