The man is on a ski boat in the water.
There is a person out on the water.
Man is a person
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 p1 s1 x1 x2.(n_water(x2) & on(p1,x2) & a_out(s1) & Manner(p1,s1) & exists x3.((x1 = x3) & n_person(x3)))