The man is on a ski boat in the water.
The guy is taking a trip in his boat to an island.
The man is on a ski boat in the water but not taking a trip.
exists p1 x1 x4.(n_water(x4) & n_man(x1) & exists x2 x3.(on(x1,x2) & in(x2,x4) & n_boat(x2) & of(x2,x3) & n_ski(x3)))
exists e1 x1 x2 x3 x4.(n_boat(x3) & of(x3,x1) & n_male(x1) & n_guy(x1) & Theme(e1,x2) & Actor(e1,x1) & v_take(e1) & in(x2,x3) & to(x3,x4) & n_island(x4) & n_trip(x2))