immer
(- mit Vorbehalt)

Vor 40 Jahren wurde uns beigebogen, dass vor because kein Komma kommt. Hat da mein alter Pauker falsch gelegen?

Ich weiss es nicht und kann nur den Link hier zur Diskussion beisteuern:
Siehe auch: because

Also meine Lehrerin behauptet, dass vor because immer ein Komma gehört. Aber weiß von früher noch, dass mir gesagt wurde, dass man vor because nie ein Komma setzt.
Jetzt habe ich schon ab und zu gelesen, dass man nicht immer ein Komma setzt, manchmal aber doch...
Kann es sein, dass die Englische Kommasetzung ziemlich willkürlich ist? Ich glaube schon... :-)

http://wire.rutgers.edu/p_grammar_comma2.html

4. Do not use a comma to set off a because clause

A because clause needs to be set off by a comma only when it begins a sentence. Here are some reminders about when to use a comma with a because clause.

1. Use a comma after a because clause that comes before a main clause.

Example: Because the owner was arrested for embezzling retirement funds the company's stock fell.

Here the main clause is the company's stock fell. A comma is needed after the because clause at the beginning of the sentence

Revised: Because the owner was arrested for embezzling retirement funds, the company's stock fell.

2. Do not use a comma before a because clause that follows a main clause.

Example: The company's stock fell, because the owner was arrested for embezzling retirement funds.

Here the main clause (The company's stock fell) begins the sentence. No comma is needed between the main clause and the because clause that follows it.

Revised: The company's stock fell because the owner was arrested for embezzling retirement funds.

Remember: Use a comma after a because clause. Don't use a comma before a because clause.

Willkürlich. Nope! But I couldn't give you rules, hm--us probably could ;-)

I hope your teacher wouldn't say a comma is required before this "because":

However, what Heinlein did not understand—undoubtedly because he did not have access to any data about atomic weapons—was that atomic bombs were heavy. ...
www.thespacereview.com/article/901/1 - 20k

-- because if so, she would be gravely wrong.

Ich möchte nur hierauf verweisen: Siehe auch: Commas are arbitrary and useless in German, a...

#5
"Remember: Use a comma after a because clause. Don't use a comma before a because clause."

This is not bad as a rule of thumb, because it helps beginners in simple cases (one affirmative statement as a main clause, one subordinate clause, etc.) But it is an over-simplification, because it doesn't explain more complicated cases.

For instance, if the "because" clause does not modify the immediately preceding verb (without taking account of a preceding negation), things get more complicated.

To play around with an example from Fowler's:

"I know he committed suicide, because his wife told me.".
"I didn't know he committed suicide because his wife slept with me .".

Without a comma the "because" clause usually modifies the immediately preceding verb and is part of what is negated.

Use a comma immediately before "because" if it clarifies meaning. To take one of MikeE's examples:

Da dies gerade an anderer Stelle Thema war: Ich bilde mir eigentlich ein, ein relativ sicheres Gefühl dafür zu haben, kann das aber nicht so richtig an Regeln festmachen. Nun habe ich gerade versucht, Mikes Beispiele (#8) nachzuvollziehen und frage mich, ob das nicht sogar einen Bedeutungsunterschied ausmacht:

Yes, you're right.

When the dependent clause with 'because' precedes the main clause, it should be separated by a comma, as with most phrases and clauses that precede the subject of the sentence.

When the dependent clause with 'because' follows the main clause, there can be a difference in meaning or emphasis with or without the comma. The comma can also just be used for reasons of breath and rhythm, if the writer wants a pause.

*ausdemoff*

My sleep schedule is seriously messed up. But you're right there too. Buenas noches.

Na dann, schlaf schön! :-)