this - that - these - those 

                        That is used when the person, thing, place is more distant.

                                         >  This computer is easy to use.

                                         >  That coat on the chair is mine.

                                         >  This person is my colleague.

                                         >  That man over there is my boss. 

                                         >  This picture is clearer than that one.
 

                                          >  These letters are urgent.  Please post them immediately.

                                          >  Those men in the street are policemen.

                                          >  I like these shoes.  They're very comfortable.

                                          >  Those shoes on the shelf are too expensive.

                                          >  I like these shoes better than those shoes