A black dog runs on the beach.
A black dog chases a Frisbie tossed to him on the beach.
Just because the dog is running on the beach does not mean he chases a frisbie or that he had anything tossed to him.
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 e1 e2 s1 x1 x2 x3 x4.(n_beach(x4) & Theme(e2,x2) & Actor(e2,x1) & v_chase(e2) & on(e1,x4) & to(e1,x1) & n_male(x1) & Theme(e1,x3) & v_toss(e1) & (x2 = x3) & n_frisbie(x2) & n_dog(x1) & a_black(s1) & Theme(s1,x1))