A man plays a song on the guitar for his cat.
A person with a guitar plays for an animal.
Cat doesn't imply animal.
exists e1 x1 x2 x3 x4.(n_cat(x4) & of(x4,x3) & n_male(x3) & n_guitar(x3) & for(e1,x4) & on(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_song(x2) & n_man(x1))
exists e1 x1 x2 x3.(for(e1,x3) & n_animal(x3) & Actor(e1,x1) & v_play(e1) & with(x1,x2) & n_guitar(x2) & n_person(x1))