A small child lays on the beach while the surf washes back into the ocean.
The child is watching the waves recede.
A child laying on the beach need not be watching the waves.
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 x3.(n_recede(x2) & of(x2,x3) & n_wave(x3) & n_child(x1) & Theme(e1,x2) & Actor(e1,x1) & v_watch(e1))