Ich arbeite nicht im Wohnzimmer, sondern im Arbeitszimmer.

Questions & Answers about Ich arbeite nicht im Wohnzimmer, sondern im Arbeitszimmer.

Why does Arbeitszimmer have an "s" in the middle, while Wohnzimmer doesn't?
Both words combine a base word with Zimmer. Arbeitszimmer comes from Arbeit (work) + Zimmer. In German, compound nouns often use linking elements (Fugenlaute) to make them flow better. Base words ending in -t (like Arbeit) frequently take an -s- to make pronunciation easier. Wohnzimmer, on the other hand, comes from the verb stem wohn- (from wohnen), which attaches smoothly to Zimmer without needing an extra letter.
Is there a strict rule for when to add this linking -s- in compound nouns?
There are strong patterns, but no 100% perfect rules. You will almost always see the linking -s- after feminine nouns ending in suffixes like -ung, -heit, -keit, -schaft, or -ion (e.g., die Wohnung + die Tür = die Wohnungstür). For other words like Arbeit or Liebe (which becomes Liebesbrief), it's historical habit for pronunciation. The best approach at this level is to simply memorize the linking element as part of the new compound word's spelling.
Why is "but" translated as sondern here and not aber?
You must use sondern (meaning "but rather") when you are directly correcting or contradicting a negative statement. Since the first clause contains nicht (I don't work in the living room), the second clause uses sondern to provide the correct alternative (I work in the study). If the first clause didn't have a negative, or if you were just adding contrasting info (e.g., "I don't work in the living room, but I watch TV there"), you would use aber.
A quick refresher: why do both rooms use im instead of in?
im is a mandatory contraction of in dem. Both Wohnzimmer and Arbeitszimmer get their gender from their final noun, das Zimmer (neuter). Because you are describing a fixed location where an action is happening—answering "where?" rather than "where to?"—the two-way preposition in requires the dative case. This changes the article das to dem.

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