A boy playing in a lake
A boy in the water.
A lake is a body of water.
exists x1 x2 x3.(a_topic(x1) & in(x1,x3) & n_lake(x3) & n_playing(x1) & of(x1,x2) & n_boy(x2))
exists x1 x2.(n_water(x2) & a_topic(x1) & in(x1,x2) & n_boy(x1))