A brown dog is running in the sand.
The canine is taking a nap.
The dog could not be running if it is taking a nap because it would be asleep.
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_canine(x1) & Theme(e1,x2) & Actor(e1,x1) & v_take(e1) & n_nap(x2))