Breakdown of Du brauchst die Kerze für die Behandlung nicht zu kaufen.
du
you (informal singular)
kaufen
to buy
brauchen
to need
nicht
not
für
for
zu
to (infinitive marker)
die Kerze
the candle
die Behandlung
the treatment
Questions & Answers about Du brauchst die Kerze für die Behandlung nicht zu kaufen.
Why does this sentence use brauchst ... nicht zu kaufen instead of musst ... nicht kaufen?
In English, we say "you do not have to" or "you do not need to". In standard German, when you want to express that something is not necessary, you use brauchen + nicht + zu + the infinitive verb. While Du musst die Kerze nicht kaufen is understood, brauchen ... nicht zu is the most natural and grammatically elegant way to say "you don't need to" or "you don't have to".
Why is nicht placed right before zu kaufen instead of earlier in the sentence?
In this semi-modal construction, the action verb (kaufen) goes to the very end of the sentence, just like it would with a normal modal verb. Because nicht is negating the action of buying the candle, it is placed right in front of the verb phrase it negates (zu kaufen).
I see für die Behandlung. Which case is being used here?
It is in the accusative case. The preposition für (for) is a strict accusative preposition; it always forces the noun that follows it into the accusative case. Because Behandlung (treatment) is a feminine noun, the article remains die, which looks exactly the same in both the nominative and accusative cases.
Can I leave out the zu and just say Du brauchst die Kerze nicht kaufen?
In spoken, everyday German, you will actually hear native speakers drop the zu all the time, treating brauchen exactly like a regular modal verb. However, there is a famous German schoolyard saying: "Wer brauchen ohne zu gebraucht, braucht brauchen gar nicht zu gebrauchen" (He who uses brauchen without zu, doesn't need to use brauchen at all). In standard written German and in your A2 exams, you must always include the zu!
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