A boat is illuminated at night.
The sun is shining.
The sun isn't shining at night.
exists e1 x1 x2.(at(e1,x2) & n_night(x2) & Theme(e1,x1) & v_illuminate(e1) & n_boat(x1))
exists e1 x1.(n_sun(x1) & Actor(e1,x1) & v_shine(e1))