Question

relative clause
I borrowed a book from the library. I have
to return it today.​

Answer 1

Answer:

“The book which I borrowed has to be returned today” is the correct answer.

Explanation:  

A clause is a group of words that has a subject and predicate. When a clause has an independent subject it is called a main clause and when the subject is embedded or related to the main clause it is called a relative clause.

For example, a main clause is I like long drives; and example of a relative clause is I bought a new dress that I will wear to the party. In the given sentence the book is the subject, 'which I borrowed' is the related subject.

Answer 2

Explanation:

The book which you have brorrowed has to be retrun today