Wenn ich im Großraumbüro arbeite, setze ich Kopfhörer auf.

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Questions & Answers about Wenn ich im Großraumbüro arbeite, setze ich Kopfhörer auf.

Why is there a comma after arbeite?

Because the first part is a subordinate clause introduced by wenn. In German, subordinate clauses are separated from the main clause by a comma:
Wenn ich im Großraumbüro arbeite, (subordinate clause)
setze ich Kopfhörer auf. (main clause)

Why does the verb come at the end in Wenn ich im Großraumbüro arbeite?
In a wenn-clause (a subordinate clause), the conjugated verb typically goes to the end. So you get: ich … arbeite rather than ich arbeite ….
Why does the second clause start with setze ich instead of ich setze?

German main clauses follow the V2 rule: the conjugated verb must be in position 2.
Since the subordinate clause Wenn ich im Großraumbüro arbeite takes position 1 of the whole sentence, the main clause must start with the verb to keep it second:
Position 1: Wenn ich im Großraumbüro arbeite,
Position 2 (main clause verb): setze
Then the subject follows: ich

Does wenn mean if or when here?

It can mean either, depending on context. In sentences like this, it often means whenever/when(ever) (a repeated situation):
Wenn ich … arbeite, … = Whenever I work …, I …

If you meant a one-time past event, German would often use als instead of wenn.

Why is it im Großraumbüro and not in das Großraumbüro?

im = in dem and uses the dative case, which is used for location (being somewhere): in the open-plan office.
in das (accusative) would imply movement/direction: into the open-plan office.

What exactly is im?

im is a contraction: in demim.
German often contracts common preposition + article combinations (especially in speech and writing), e.g. am = an dem, zum = zu dem.

Why is Großraumbüro one word, and what does it literally mean?

German frequently forms compound nouns. Großraumbüro is a compound meaning an open-plan office.
Roughly: Großraum (large room/open-plan space) + Büro (office) → Großraumbüro.

Why is Großraumbüro capitalized?
All nouns in German are capitalized, including compound nouns. Büro is a noun, so Großraumbüro is capitalized too.
Why is auf at the end in setze ich Kopfhörer auf?

Because aufsetzen is a separable verb: auf- + setzen.
In a main clause, the prefix splits off and goes to the end:
Ich setze Kopfhörer auf.
In a subordinate clause or with an infinitive, it stays together:
…, weil ich Kopfhörer aufsetze. / Ich will Kopfhörer aufsetzen.

Why is there no article before Kopfhörer?

German can omit the article when talking about something in a general, non-specific way—similar to English I put on headphones.
You could also say die Kopfhörer if you mean specific ones (e.g., the ones you always use):
…, setze ich die Kopfhörer auf.