A man rides a surfboard over a wave, the nose of the board pointing downward.
The man is a professional surfer.
just because the man rides a surfboards that it doesn't mean he is a professional surfer
exists e1 e2 s1 x1 x2 x3 x4 x5 x6.(n_board(x5) & n_nose(x4) & Theme(e2,x2) & Actor(e2,x1) & v_ride(e2) & over(x2,x3) & rel(x3,x4) & a_downward(s1) & Manner(e1,s1) & Actor(e1,x6) & v_point(e1) & (x4 = x6) & of(x4,x5) & n_wave(x3) & n_surfboard(x2) & n_man(x1))
exists p1 x1.(n_man(x1) & exists s1 x2.((x1 = x2) & n_surfer(x2) & a_professional(s1) & Theme(s1,x2)))