A boat is illuminated at night.
The boat is on the water.
Just because the boat is illuminated does not mean it's on the water.
exists e1 x1 x2.(at(e1,x2) & n_night(x2) & Theme(e1,x1) & v_illuminate(e1) & n_boat(x1))
exists p1 x1 x2.(n_water(x2) & n_boat(x1) & on(x1,x2))