Hello, fellas. After learning about how to use expressions of quantity in relative clauses last week, today we are still going to have a session on another form of relative clauses. It is the use of noun + of which.
(More on expressions of quantity in relative clauses: https://englishtips4u.com/2018/08/30/grammartrivia-expressions-of-quantity-in-relative-clauses/)
According to Betty Schrampfer Azar, the pattern has the same meaning of whose. In other words, both of them show possession. Noun + of which is used in a relative clause modifying a thing and more common in formal written English. It is preceded by a comma.
1) Leo Tolstoy wrote a novel. The title of the novel is Anna Karenina.
Leo Tolstoy wrote a novel, the title of which is Anna Karenina.
2) The student bought a book. The price of the book was affordable.
The student bought a book, the price of which was affordable.
3) They like Indonesian food. The taste of the food is spicy.
They like Indonesian food, the taste of which is spicy.
Betty Schrampfer Azar, Understanding and Using English Grammar: Third Edition