которую

которую

"Которую" means "which" or "that" (feminine singular accusative form).

The word 'которую' refers to the book as the object being acted upon in the subordinate relative clause.

Вот книга, которую я вчера читал.

Here is the book that I read yesterday.

The word 'которую' is used to refer to the girl as the object in the relative clause.

Я знаю девушку, которую ты видел вчера.

I know the girl whom you saw yesterday.

Here, 'которую' identifies the car as the desired object in the context of the relative clause.

Он купил машину, которую давно хотел.

He bought the car that he had wanted for a long time.