A white guy is playing a blue guitar.
the man is singing his favorite song
the fact that the guy is playing the guitar does not imply that he is singing his favorite song.
exists e1 s1 s2 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_guitar(x2) & a_blue(s2) & Theme(s2,x2) & n_guy(x1) & a_white(s1) & Theme(s1,x1))
exists e1 s1 x1 x2.(n_song(x2) & a_favorite(s1) & Theme(s1,x2) & of(x2,x1) & n_male(x1) & n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_sing(e1))