A surfer in a wetsuit crests a wave.
A surfer is showing off in front of others.
Not every surfer in a wetsuit crests a wave is showing off.
exists e1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_crest(e1) & n_wave(x3) & in(x1,x2) & n_wetsuit(x2) & n_surfer(x1))
exists e1 s1 x1 x2 x3.(in(e1,x2) & of(x2,x3) & -(x3 = x1) & n_person(x1) & n_person(x3) & n_front(x2) & a_off(s1) & Manner(e1,s1) & Actor(e1,x1) & v_show(e1) & n_surfer(x1))