This, that, these and those are demonstrative pronouns. We use them to point to people or things. This is a book. That is a pen. These are books. Those are pens. We use this, that, these and those to point to people or things. This is a book. = I am pointing to a book. That is a pen. = You are pointing to a pen. These are books. = We are pointing to some books. Those are pens. = They are pointing to some pens. We use this, that, these and those to point to people or things. This is a book. That is a pen. These are books. Those are pens. This, that, these and those are demonstrative pronouns. We use them to point to people or things. This is a book. That is a pen. These are books. Those are pens.