a dog on a leash jumps over a stone wall.
An animal is being walked on a leash.
A dog on a leash need not mean it is being walked.
exists s1 x1 x2 x3 x4.(a_topic(x1) & over(x1,x3) & n_wall(x3) & of(x3,x4) & n_stone(x4) & on(x1,x2) & n_jump(x2) & a_leash(s1) & Theme(s1,x2) & n_dog(x1))
exists e1 x1 x2.(on(e1,x2) & n_leash(x2) & Theme(e1,x1) & v_walk(e1) & n_animal(x1))