A man rides a surfboard through rough white and blue water.
A surfer rides a wave.
If you ride a surfboard, you're a surfer riding a wave.
exists e1 s1 s2 s3 x1 x2 x3.(through(e1,x3) & n_water(x3) & a_blue(s3) & Theme(s3,x3) & a_white(s2) & Theme(s2,x3) & a_rough(s1) & Theme(s1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_surfboard(x2) & n_man(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_wave(x2) & n_surfer(x1))