A black dog runs on the beach.
There is a black dog running on the beach.
A black dog runs and is running on the beach...two different forms of the verb.
exists e1 s1 x1 x2.(n_beach(x2) & on(e1,x2) & Actor(e1,x1) & v_run(e1) & n_dog(x1) & a_black(s1) & Theme(s1,x1))
exists p1 x1 x4.(n_beach(x4) & exists e1 s1 x2 x3.((x1 = x2) & on(e1,x4) & Actor(e1,x3) & v_run(e1) & (x2 = x3) & n_dog(x2) & a_black(s1) & Theme(s1,x2)))