The surfer is in the wave.
a person goes pattleboating
Surfing is not the same as pattleboating.
exists p1 x1 x2.(n_wave(x2) & n_surfer(x1) & in(x1,x2))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_go(e1) & n_pattleboating(x2) & n_person(x1))