A man surfing on a big green wave.
A man on the beach is holding a surfboard.
One person is holding the surfboard while the other is actually surfing.
exists e1 s1 s2 x1 x2 x3.(a_topic(x1) & on(e1,x3) & n_wave(x3) & a_green(s2) & Theme(s2,x3) & a_big(s1) & Theme(s1,x3) & Actor(e1,x2) & v_surf(e1) & (x1 = x2) & n_man(x1))
exists e1 x1 x2 x3.(n_beach(x2) & Theme(e1,x3) & Actor(e1,x1) & v_hold(e1) & n_surfboard(x3) & on(x1,x2) & n_man(x1))