A black dog bounds across the sand.
The dog is at the beach.
Sand does not necessarily indicate there is beach.
exists e1 s1 x1 x2.(n_sand(x2) & across(e1,x2) & Actor(e1,x1) & v_bound(e1) & n_dog(x1) & a_black(s1) & Theme(s1,x1))
exists p1 x1 x2.(n_beach(x2) & n_dog(x1) & at(x1,x2))