This, that, these, those

This + (N=1 + near) 

That + (N=1 + far)

These + (N>1 + near)

Those + (N>1 + far) 

This book

That book

These books

Those books

This + N=1  ==>  This =1 + Vs

That + N=1  ==>  That =1 + Vs

These + N>1  ==>  These >1 + V

Those + N>1  ==>  Those >1 + V

This book is mine. || This is mine.

That book is yours. || That is yours.

These books are cheap. || These are cheap.

Those books are expensive. || Those are expensive.