a boy scales the wall.
the boy is doing his homework
If a boy scales the wall he is not doing his homework.
exists e1 x1 x2.(n_wall(x2) & Theme(e1,x2) & Actor(e1,x1) & v_scale(e1) & n_boy(x1))
exists e1 x1 x2.(n_homework(x2) & of(x2,x1) & n_male(x1) & n_boy(x1) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1))