A boy sitting in water.
A boy is sitting in a tub of water and playing with a boat.
Sitting does not imply playing and being in water does no imply being in a tub.
exists e1 x1 x2 x3.(a_topic(x1) & in(e1,x3) & n_water(x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_boy(x1))
exists e1 x1 x2 x3 x4 x5 x6.(with(e1,x6) & n_boat(x6) & in(e1,x2) & of(x2,x3) & subset_of(x5,x3) & n_playing(x5) & subset_of(x4,x3) & n_water(x4) & n_tub(x2) & Actor(e1,x1) & v_sit(e1) & n_boy(x1))