A boat is illuminated at night.
people keep an eye on the expensive boat
Just because the boat is illuminated does not mean people keep an eye on it, nor that it is an expensive boat.
exists e1 x1 x2.(at(e1,x2) & n_night(x2) & Theme(e1,x1) & v_illuminate(e1) & n_boat(x1))
exists e1 s1 x1 x2 x3.(n_boat(x3) & a_expensive(s1) & Theme(s1,x3) & on(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_keep(e1) & n_eye(x2) & n_people(x1))