Possessive determiners are used to modify a following noun : Your book, John's book. ('Your' / 'John's' : Possessive determiner).
This book is yours. (Here, 'yours' ----> a possessive pronoun.)
This book is John's. (Here, 'John's' -----> a possessive noun)
I know the double possessive follows a noun. But can we use double possessive after the 'be'-verbs?
(1) This book is of yours (instead of, "This is a book of yours. )
(2) This book is of John's (instead of "This is a bookof John's.)