The surfer rides a wave on a blue surfboard.
the surfer caught a huge wave while surfing
The surfer rides a wave must mean he caught a wave.
exists e1 s1 x1 x2 x3.(n_surfer(x1) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & on(x2,x3) & n_surfboard(x3) & a_blue(s1) & Theme(s1,x3) & n_wave(x2))
exists e2 e1 s1 x1 x2.(n_surfer(x1) & while(e1,e2) & Actor(e2,x1) & v_surf(e2) & Theme(e1,x2) & Actor(e1,x1) & v_catch(e1) & n_wave(x2) & a_huge(s1) & Theme(s1,x2))