His chair = a boy's chair
Her ruler = a girl's ruler
This book = a book close to me
Their table = Two pupils' table
A pencil-case = Any pencil-case
A window = Any window
Her notebook = A girl's notebook
This door = The door close to me
His head = A boy's head
Her pencil-case = A girl's pencil-case
This light = The light close to me
That book = a book far from me
His pencil-case = A boy's pencil-case
A notebook = Any notebook
That door = The door far from me
His notebook = A boy's notebook
his chair her ruler this book their table a pencil-case a window her notebook this door your red pen his head her pencil-case this light that book his pencil-case a notebook that door his notebook
etc.