Young boy on a floatation device in a lake with boats nearby.
A boy floats on a lake.
A boy using a flotation device in a lake is floating.
exists s1 x1 x2 x3 x4 x5.(a_topic(x1) & on(x1,x2) & in(x2,x4) & with(x4,x5) & r_nearby(x5) & n_boat(x5) & n_lake(x4) & n_device(x2) & of(x2,x3) & n_floatation(x3) & n_boy(x1) & a_young(s1) & Theme(s1,x1))
exists e1 x1 x2.(on(e1,x2) & n_lake(x2) & Actor(e1,x1) & v_float(e1) & n_boy(x1))