
wofür
what ... for
Asks about the purpose or intended use of something.
Wofür brauchst du diese große Zange?
What do you need this large pair of pliers for?
what ... for
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what ... for
Asks about the purpose or intended use of something.
Wofür brauchst du diese große Zange?
What do you need this large pair of pliers for?

what ... for
Asks about something that an action, feeling, or decision relates to with the preposition 'für' (for).
Wofür interessierst du dich besonders?
What are you particularly interested in?

what ... for
Asks about the reason or occasion for a reaction, reward, or punishment.
Wofür wurde der Fahrer bestraft?
What was the driver punished for?

for which / for what
Introduces a subordinate clause and refers to something mentioned previously or to the content of an entire sentence. Depending on the context, it means 'für das' (for that) or 'für diese Sache' (for this matter).
Sie hat mir beim Umzug geholfen, wofür ich ihr sehr dankbar bin.
She helped me move, for which I am very grateful to her.
'Wofür' consists of 'wo' and 'für' and is used to ask about a thing, a situation, or a purpose. It is always written as one word.
Wofür soll diese komplizierte Vorrichtung gut sein?
What is this complicated device supposed to be used for?
When 'wofür' begins a direct question, the finite verb follows directly after it. In a subordinate clause with 'wofür', the finite verb comes at the end.
Wofür hast du dich gestern entschieden?
What did you decide on yesterday?
Ich weiß nicht, wofür er sich entschieden hat.
I don't know what he decided on.
When asking about purpose, 'wofür' is often used with 'brauchen' (to need) or 'verwenden' (to use). With 'dienen' (to serve), however, you use 'wozu': 'Wozu dient diese Vorrichtung?' (What purpose does this device serve?)
Wofür verwendet man dieses Werkzeug?
What is this tool used for?
'Wofür' takes the place of the complement with 'für' (for) in verbs that require this preposition. The rest of the verb construction remains unchanged, including the reflexive pronoun with reflexive verbs.
Wofür schämst du dich eigentlich?
What are you actually ashamed of?
When referring to rewards and punishments, 'wofür' is often used with the participles 'belohnt' (rewarded) or 'bestraft' (punished). In the passive voice, it asks about the reason for the action.
Wofür wurde die Sportlerin nach dem Wettkampf ausgezeichnet?
What was the athlete honored for after the competition?
As a linking word, 'wofür' refers to something mentioned previously or to the content of an entire sentence. It is followed by a subordinate clause with the verb at the end, and the subordinate clause is separated by a comma.
Er hat mir die schwierige Aufgabe erklärt, wofür ich ihm sehr dankbar bin.
He explained the difficult task to me, for which I am very grateful to him.