A surfer in a black wetsuit rides a wave.
A surfer in a black wet suit catches a wave in a competition.
Not every surfer riding a wave is doing so for a competition.
exists e1 s1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_ride(e1) & n_wave(x3) & in(x1,x2) & n_wetsuit(x2) & a_black(s1) & Theme(s1,x2) & n_surfer(x1))
exists e1 s1 x1 x2 x3 x4 x5.(Theme(e1,x4) & Actor(e1,x1) & v_catch(e1) & in(x4,x5) & n_competition(x5) & n_wave(x4) & in(x1,x2) & n_suit(x2) & of(x2,x3) & n_wet(x3) & a_black(s1) & Theme(s1,x2) & n_surfer(x1))