a woman walks to the cows.
A woman is walking on the farm.
The woman and the cows aren't necessarily on a farm.
exists e1 x1 x2.(n_cow(x2) & to(e1,x2) & Actor(e1,x1) & v_walk(e1) & n_woman(x1))
exists e1 x1 x2.(n_farm(x2) & on(e1,x2) & Actor(e1,x1) & v_walk(e1) & n_woman(x1))