A man on a tall ladder is repairing a machine.
man selling toys
One cannot be selling toys and repairing a machine simultaneously.
exists e1 s1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_repair(e1) & n_machine(x3) & on(x1,x2) & n_ladder(x2) & a_tall(s1) & Theme(s1,x2) & n_man(x1))
exists x1 x2 x3.(n_toy(x1) & of(x1,x3) & n_selling(x3) & of(x1,x2) & n_man(x2) & a_topic(x1))