The boy is in the swimming pool.
The boy is in water.
swimming pool is full of water.
exists p1 x1 x2 x3.(n_pool(x2) & of(x2,x3) & n_swimming(x3) & n_boy(x1) & in(x1,x2))
exists p1 x1.(n_boy(x1) & exists x2.(in(x1,x2) & n_water(x2)))