a man jumps over a wave on his surfboard.
The man is surfing.
jumps over a wave on his surfboard almost the same as   surfing.
exists e1 x1 x2 x3.(over(e1,x2) & on(x2,x3) & n_surfboard(x3) & of(x3,x1) & n_male(x1) & n_wave(x2) & Actor(e1,x1) & v_jump(e1) & n_man(x1))
exists e1 x1.(n_man(x1) & Actor(e1,x1) & v_surf(e1))