A dog leaps on the sandy beach.
The lion chases birds on the beach shore.
Subject could be either a lion or a dog.
exists e1 x1 x2 x3.(n_beach(x2) & of(x2,x3) & n_sandy(x3) & on(e1,x2) & Actor(e1,x1) & v_leap(e1) & n_dog(x1))
exists e1 x1 x2 x3 x4.(n_shore(x3) & of(x3,x4) & n_beach(x4) & n_lion(x1) & on(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_chase(e1) & n_bird(x2))