Two dogs run through a field.
The dogs are chasing a rabbit.
Just because two dogs run through a field does not mean they are chasing anything, and no rabbit has been observed.
exists e1 x1 x2.(through(e1,x2) & n_field(x2) & Actor(e1,x1) & v_run(e1) & n_dog(x1) & card_eq_2(x1))
exists e1 x1 x2.(n_dog(x1) & Theme(e1,x2) & Actor(e1,x1) & v_chase(e1) & n_rabbit(x2))