A brown dog is running in the sand.
The brown dog is on the beach.
Just because the dog is in the sand does not mean it is on a beach.
exists e1 s1 x1 x2.(n_sand(x2) & in(e1,x2) & Actor(e1,x1) & v_run(e1) & n_dog(x1) & a_brown(s1) & Theme(s1,x1))
exists p1 s1 x1 x2.(n_beach(x2) & n_dog(x1) & a_brown(s1) & Theme(s1,x1) & on(x1,x2))