her
The German word 'ihr' is a possessive pronoun used to indicate possession or ownership. It is used when the subject is feminine or plural. For example, 'ihr Buch' means 'her book' or 'their book'. It is important to note that 'ihr' can also be used as a personal pronoun, but in that case, it is capitalized as 'Ihr' and is used to address someone formally.
You are my best friends.
In this sentence, 'ihr' is used as a subject pronoun in the second person plural form, which is equivalent to 'you' in English when referring to more than one person.
Your car is very fast.
Here, 'ihr' is used as a possessive pronoun in the second person singular and plural form. It's equivalent to 'your' in English and can refer to a possession of one person or multiple people.
Are you giving her the book?
In this example, 'ihr' is used as an indirect object pronoun in the third person singular form, which is equivalent to 'her' in English. The sentence is asking if the book is being given to her.