A boy and girl play in water.
A boy and girl play in water at the beach.
The boy and the girl don't have to be at the beach to play in water.
exists x1 x2 x3 x4.(a_topic(x1) & in(x1,x4) & n_water(x4) & n_play(x1) & of(x1,x3) & n_girl(x3) & of(x1,x2) & n_boy(x2))
exists x1 x2 x3 x4 x5.(n_beach(x5) & a_topic(x1) & at(x1,x5) & in(x1,x4) & n_water(x4) & n_play(x1) & of(x1,x3) & n_girl(x3) & of(x1,x2) & n_boy(x2))