No. 917 in Polish
którymi
"Którymi" means "which" or "whom" in instrumental plural form.
In a sentence
To są książki, z którymi się zapoznałem podczas studiów.
These are the books with which I became acquainted during my studies.
In this sentence, 'którymi' is used as an instrumental case relative pronoun referring to 'książki' (books).
Zastanawiam się nad trudnościami, z którymi musieliśmy się zmierzyć.
I am reflecting on the difficulties with which we had to contend.
Here, 'którymi' refers to 'trudnościami' (difficulties) and denotes the instrumental case for dealing with these difficulties.
Oto zadania, z którymi będziemy pracować w tej lekcji.
Here are the tasks with which we will work in this lesson.
In this example, 'którymi' is instrumental and relates to 'zadania' (tasks), indicating what will be worked upon.
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