This is the 268th most frequent Serbian word.
књига
The Serbian word "књига" means "book" in English.
In this sentence, 'књига' is used as the subject of the sentence, referring to a specific book.
Ова књига је веома занимљива и препоручујем је свима.
This book is very interesting and I recommend it to everyone.
Here, 'књигу' is the object of the verb 'вратити', showing its usage in the accusative case.
Морам вратити књигу у библиотеку до сутра.
I must return the book to the library by tomorrow.
In this sentence, 'књига' is in the plural form to denote multiple books and is used in the nominative case.