A brown dog is running in the sand.
The pup  is playing at the beach.
Just because the dog is in the sand does not mean it is on a beach. The dog running does not mean it is a pup, dogs of all ages like to run.
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 e1 x1 x2.(n_beach(x2) & n_pup(x1) & at(e1,x2) & Actor(e1,x1) & v_play(e1))