This is the 5873rd most frequent German word.
buy
The German word for "buy" in English is "to purchase."
The verb 'kaufen' (to buy) is used in its present tense first person singular form 'kaufe' to express an action being performed currently.
Ich kaufe ein Buch.
I buy a book.
The verb 'kaufen' is used here alongside the modal verb 'wollen' (to want) in its infinitive form, indicating the intention of purchasing something.
Er will ein Geschenk kaufen.
He wants to buy a gift.
The verb 'kaufen' is used in the perfect tense to describe a completed action in the past, formed by the auxiliary verb 'haben' and the past participle 'gekauft'.