A boy on the street holds a box.
There is a person holding an object.
A boy is a person and holds a box is also holding an object.
exists e1 x1 x2 x3.(n_street(x2) & Theme(e1,x3) & Actor(e1,x1) & v_hold(e1) & n_box(x3) & on(x1,x2) & n_boy(x1))
exists p1 x1 e1 x2 x3 x4.((x1 = x2) & Theme(e1,x4) & Actor(e1,x3) & v_hold(e1) & n_object(x4) & (x2 = x3) & n_person(x2))