A man is sky surfing on the water.
A man is surfing for fun.
Sentence 1 is missing surfing for fun
exists p1 x1 x4.(n_water(x4) & exists e1 x2 x3.((x1 = x2) & on(e1,x4) & Actor(e1,x3) & v_surf(e1) & (x2 = x3) & n_sky(x2)) & n_man(x1))
exists e1 x1 x2.(for(e1,x2) & n_fun(x2) & Actor(e1,x1) & v_surf(e1) & n_man(x1))