the two boys playing guitar
Two boys are playing electric guitar
the two boys playing guitar does not indicate they are playing electric guitar
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 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_guitar(x2) & a_electric(s1) & Theme(s1,x2) & n_boy(x1) & card_eq_2(x1))