A little boy with a net at the beach walks back to shore.
A little boy is on the beach.
at the beach implies  on the beach.
exists e1 p1 s1 x1 x2 x3.(n_beach(x3) & exists s2 x4.(to(s2,x4) & n_shore(x4) & Theme(s2,x1) & a_back(s2)) & Topic(e1,p1) & Actor(e1,x1) & v_walk(e1) & with(x1,x2) & at(x2,x3) & n_net(x2) & n_boy(x1) & a_little(s1) & Theme(s1,x1))
exists p1 s1 x1 x2.(n_beach(x2) & on(x1,x2) & n_boy(x1) & a_little(s1) & Theme(s1,x1))