A dog runs across sand.
The dog is running.
dog runs across sand implies that he is running.
exists e1 x1 x2.(across(e1,x2) & n_sand(x2) & Actor(e1,x1) & v_run(e1) & n_dog(x1))
exists e1 x1.(n_dog(x1) & Actor(e1,x1) & v_run(e1))