A little girl sitting in front of some lake water.
A girl is on a sandy beach.
A lake doesn't always have sandy shores, and someone can sit by a lake without being on a beach.
exists e1 s1 x1 x2 x3 x4 x5.(a_topic(x1) & in(e1,x3) & of(x3,x4) & n_water(x4) & of(x4,x5) & n_lake(x5) & n_front(x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_girl(x1) & a_little(s1) & Theme(s1,x1))
exists p1 x1.(exists s1 x2.(on(x1,x2) & n_beach(x2) & a_sandy(s1) & Theme(s1,x2)) & n_girl(x1))