Someone is in a speed boat on the water.
Someone is speedboating across high waves.
Not all water has high waves.
exists p1 x1 x4.(n_water(x4) & exists x2 x3.(in(x1,x2) & on(x2,x4) & n_boat(x2) & of(x2,x3) & n_speed(x3)) & n_person(x1))
exists e1 s1 x1 x2.(across(e1,x2) & n_wave(x2) & a_high(s1) & Theme(s1,x2) & Actor(e1,x1) & v_speedboat(e1) & n_person(x1))