Two dogs run in a field.
Some dachshunds chase after a ball.
Not all dogs are dachshunds.  If the dogs run, that does not necessarily mean the dogs will chase a ball.
exists e1 x1 x2.(in(e1,x2) & n_field(x2) & Theme(e1,x1) & v_run(e1) & n_dog(x1) & card_eq_2(x1))
exists e1 x1 x2 x3.(after(e1,x3) & n_ball(x3) & Theme(e1,x2) & Actor(e1,x1) & v_dachshund(e1) & n_chase(x2) & n_thing(x1))