A dog runs in a grassy field.
A dog is chasing a sheep.
A dog runs in a grassy field does not imply that it is chasing a sheep.
exists e1 s1 x1 x2.(in(e1,x2) & n_field(x2) & a_grassy(s1) & Theme(s1,x2) & Actor(e1,x1) & v_run(e1) & n_dog(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_chase(e1) & n_sheep(x2) & n_dog(x1))