This is a young boy on a beach holding a stick.
A sandy haired your boy holding a stick in the water.
Not all boys have sandy hair, and it cannot be inferred that he is holding the stick in the water.
exists p1 x1.(n_thing(x1) & exists e1 s1 x2 x3 x4 x5.((x1 = x2) & on(x2,x3) & Theme(e1,x5) & Actor(e1,x4) & v_hold(e1) & n_stick(x5) & (x3 = x4) & n_beach(x3) & n_boy(x2) & a_young(s1) & Theme(s1,x2)))
exists e1 e2 x1 x2 x3 x4.(n_water(x4) & for(e1,e2) & in(e2,x4) & Theme(e2,x3) & Actor(e2,x1) & v_hold(e2) & n_stick(x3) & Theme(e1,x2) & Actor(e1,x1) & v_hair(e1) & n_boy(x2) & of(x2,x1) & n_person(x1) & n_sandy(x1))