The man is playing a guitar.
A person is playing an instrument.
THE MAN IS A PERSON.
exists e1 x1 x2.(n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_guitar(x2))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_instrument(x2) & n_person(x1))