This book is her book.
This book is hers.
This is our new classroom.
This new classroom is ours.
This laptop is not my laptop.
This laptop is not mine.
This phone is his phone.
This phone is his.
Those cookies on the table are her cookies.
Those cookies on the table are hers.
These magazines are our magazines.
These magazines are ours.
These pencils are my pencils.
These pencils are mine.
These bags are Kurumi's and Kouta's bags.
These bags are theirs.
Is this pen your pen?
Is this pen yours?
These shirts are their shirts.
These shirts are theirs.