A boat on the water.
A car is racing down the road.
A car is not a boat.
exists x1 x2.(n_water(x2) & a_topic(x1) & on(x1,x2) & n_boat(x1))
exists e1 s1 x1 x2.(n_road(x2) & a_down(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_race(e1) & n_car(x1))