the two boys playing guitar
The boys enjoying music.
Just because the boys are playing guitar does not imply that they are enjoying music.
exists e1 x1 x2 x3.(n_boy(x1) & card_eq_2(x1) & a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_play(e1) & n_guitar(x3) & (x1 = x2))
exists e1 x1 x2 x3.(n_boy(x1) & a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_enjoy(e1) & n_music(x3) & (x1 = x2))