A small child lays on the beach while the surf washes back into the ocean.
The child is running through the waves.
It is impossible to lay on the beach while running through the waves at the same time. One activity involves laying down and the other involves running.
exists e1 p1 s1 x1 x2 x3 x4.(n_ocean(x4) & n_surf(x3) & n_beach(x2) & exists e2 p2.(exists s2.(into(s2,x4) & Theme(s2,x3) & a_back(s2)) & Topic(e2,p2) & Actor(e2,x3) & v_wash(e2)) & while(e1,p1) & on(e1,x2) & Actor(e1,x1) & v_lay(e1) & n_child(x1) & a_small(s1) & Theme(s1,x1))
exists e1 x1 x2.(n_wave(x2) & n_child(x1) & through(e1,x2) & Actor(e1,x1) & v_run(e1))