A speedboat racer stands on his boat in the water.
A man is on his boat
A speedboat racer could be a man.
exists e1 x1 x2 x3 x4.(n_water(x4) & on(e1,x3) & in(x3,x4) & n_boat(x3) & of(x3,x1) & n_male(x1) & Actor(e1,x1) & v_stand(e1) & n_racer(x1) & of(x1,x2) & n_speedboat(x2))
exists p1 x1 x2.(on(x1,x2) & n_boat(x2) & of(x2,x1) & n_male(x1) & n_man(x1))