A small black dog walks in the sand.
A dog is at the beach.
Just because a dog walks in sand does not mean it is at a beach.
exists e1 s1 s2 x1 x2.(n_sand(x2) & in(e1,x2) & Actor(e1,x1) & v_walk(e1) & n_dog(x1) & a_black(s2) & Theme(s2,x1) & a_small(s1) & Theme(s1,x1))
exists p1 x1 x2.(n_beach(x2) & at(x1,x2) & n_dog(x1))