because
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because
Introduces a subordinate clause that gives the reason or cause for the action in the main clause. The verb in the subordinate clause comes at the end.
Ich kann heute nicht kommen, weil ich krank bin.
I can't come today because I am sick.
As a subordinating conjunction, 'weil' (because) introduces a subordinate clause. The conjugated verb must therefore always stand at the end of the clause. This is the correct form in written and standard language.
Ich lerne Deutsch, weil ich in Berlin arbeiten möchte.
I am learning German because I would like to work in Berlin.
In spoken language, 'weil' (because) is often used like a main-clause conjunction. The verb then stands directly after 'weil' in position 2. This use is very common but is considered colloquial.
Ich kann nicht mitkommen, weil ich muss noch lernen.
I can't come along, because I still have to study.
The position of the verb reveals the style. If the verb is at the end, it is standard language. If it is in position 2 after 'weil' (because), it is colloquial speech. Pay attention to this when listening in order to understand the context better.
Er kommt nicht mit, weil er müde ist.
He is not coming along because he is tired.
because
'denn' and 'weil' both give a reason. The most important difference is the sentence structure. After 'denn', a main clause follows with normal word order: the verb is in second position. After 'weil', a subordinate clause normally follows: the verb is at the end. Learners often confuse the words because both can answer 'Warum?' (Why?). In standard German, 'weil' with the verb at the end is the safe form. 'denn' often sounds somewhat explanatory and connects two main clauses.
Im Sommer arbeiten wir weniger, weil viele Kollegen im Urlaub sind.
In summer, we work less because many colleagues are on vacation.
Sie geht früh nach Hause, denn sie ist nach dem Gespräch müde.
She goes home early because she is tired after the conversation.