A person riding a surfboard comes up over a large wave.
A person watches a man ride a surfboard
A large wave is not a surfboard.  Riding is not watching.
exists e2 e1 s1 s2 x1 x2 x3 x4.(over(e2,x4) & n_wave(x4) & a_large(s2) & Theme(s2,x4) & a_up(s1) & Manner(e2,s1) & Actor(e2,x1) & v_come(e2) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & n_surfboard(x3) & (x1 = x2) & n_person(x1))
exists x1.(all x2.(n_surfboard(x2) -> exists e1 x3 x4.(Theme(e1,x3) & Actor(e1,x1) & v_watch(e1) & for(x3,x2) & n_ride(x3) & of(x3,x4) & n_man(x4))) & n_person(x1))