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Questions & Answers about Der Chef kauft den Drucker.
Why is it "den Drucker" instead of "der Drucker"?
Drucker is a masculine noun. In this sentence, it is the direct object, meaning it is the thing being bought. In German, when a masculine noun is the direct object, its word for "the" changes from the nominative (subject) der to the accusative (object) den.
Why does "Der Chef" stay as "Der" and not change to "Den"?
Because Der Chef is the subject of the sentence (the person doing the buying). The subject always takes the nominative case, so masculine nouns use der. Only the object (the printer) changes to the accusative case here.
Does "Chef" mean the person cooking the food?
No, Chef is a false friend. It looks like the English word "chef", but it actually means "boss" or "manager". If you want to talk about a cook in a restaurant, you would use the word der Koch.
The translation says "is buying", but isn't "kauft" just "buys"?
German only has one present tense. So kauft translates to both "buys" and "is buying" depending on what makes the most sense in English. You never need extra words like "is" to show an ongoing action in German.