Non defining: I bought this book at City Lights Bookstore. I finished the book in two days.
I bought this book, which I finished in two days, at City Lights.
Non defining: I bought this book at City Lights Bookstore. I finished the book in two days.
I bought this book, which I finished in two days, at City Lights.
Defining: Movies are not successful. The movies' characters are not believable.
Movies whose characters are not believable are not successful.
