A man in a wetsuit rides a surfboard on a wave with a bright sun and blue sky in the background.
a man surfs the ocean
Riding a surfboard is not necessarily surfing. Surfing does not automatically imply ocean as the location.
exists e1 s1 s2 x1 x2 x3 x4 x5 x6 x7 x8.(n_background(x8) & on(e1,x4) & in(x4,x8) & with(x4,x5) & n_sky(x7) & a_blue(s2) & Theme(s2,x7) & n_sun(x6) & a_bright(s1) & Theme(s1,x6) & subset_of(x7,x5) & subset_of(x6,x5) & n_wave(x4) & Theme(e1,x3) & Actor(e1,x1) & v_ride(e1) & n_surfboard(x3) & in(x1,x2) & n_wetsuit(x2) & n_man(x1))
exists e1 x1 x2.(n_ocean(x2) & Theme(e1,x2) & Actor(e1,x1) & v_surf(e1) & n_man(x1))