
für
for
Indicates the recipient or beneficiary of an action or thing; expresses a purpose.
Ich habe ein Geschenk für dich gekauft.
I bought a gift for you.
for
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for
Indicates the recipient or beneficiary of an action or thing; expresses a purpose.
Ich habe ein Geschenk für dich gekauft.
I bought a gift for you.

for
Indicates a duration of time.
Wir fahren für zwei Wochen in den Urlaub.
We're going on vacation for two weeks.

for
Indicates a price or exchange value.
Ich habe das Fahrrad für 100 Euro bekommen.
I got the bike for 100 euros.

for
Expresses agreement with or support for an idea, person, or thing.
Ich bin für deinen Vorschlag, wir sollten das so machen.
I'm for your suggestion; we should do it that way.

for
Used to make a comparison in relation to a particular standard or expectation.
Für einen Montag ist heute erstaunlich wenig Verkehr.
For a Monday, there is surprisingly little traffic today.

for
Means 'instead of' or 'on behalf of'.
Da meine Kollegin krank ist, spreche ich heute für sie.
Since my colleague is sick, I'm speaking for her today.
The preposition 'für' always requires the accusative. Make sure to decline the article and pronoun after 'für' correctly.
Diese Blumen sind für meine Mutter.
These flowers are for my mother.
In addition to a recipient, 'für' can also express a purpose or goal. It then answers the question 'Wofür?' (for what?) or 'Zu welchem Zweck?' (for what purpose?). In this case, it is often followed by an abstract noun.
Wir lernen für die Prüfung.
We're studying for the exam.
When 'für' indicates a duration of time, it describes the planned length of a future or present event. Typical combinations are 'für einen Tag' (for one day), 'für ein paar Stunden' (for a few hours), or 'für immer' (forever).
Ich bin für drei Tage auf Geschäftsreise.
I'm on a business trip for three days.
The phrase 'für etwas sein' (to be for something) is very common for expressing agreement. It is often used in contrast to 'gegen etwas sein' (to be against something).
Bist du für oder gegen die neue Regelung?
Are you for or against the new regulation?
In this meaning, 'für' introduces a comparison. The structure is often: 'Für [Bezugsgröße] ist/hat [Subjekt] ...' (For [reference point], [subject] is/has ...). This puts a statement in relation to an expectation.
Für sein Alter ist er schon sehr reif.
For his age, he is already very mature.
When 'für' means 'anstelle von' (instead of), it is often used with verbs like 'sprechen' (to speak), 'antworten' (to answer), or 'einspringen' (to step in) to express representation or substitution.
Der Anwalt spricht für seinen Mandanten.
The lawyer speaks for his client.
to / too / closed
„zu“ and „für“ can both be used with a gift and a birthday. „Zum Geburtstag“ names the occasion for giving the gift, while „für den Geburtstag“ refers more to the gift’s intended purpose or timing. When the birthday celebration is the occasion, „zu“ usually fits; when the focus is on how the gift will be used, „für“ is used.

Ich habe für den Geburtstag ein Buch als Geschenk gekauft.
I bought a book as a gift for the birthday.
Ich habe dir zum Geburtstag ein Buch gekauft.
I bought you a book for your birthday.