A wakeboarder is performing a trick on a rail.
A surfer wipes out at the sight of a shark
A wakeboarder cannot become a surfer.
exists e1 x1 x2 x3.(on(e1,x3) & n_rail(x3) & Theme(e1,x2) & Actor(e1,x1) & v_perform(e1) & n_trick(x2) & n_wakeboarder(x1))
exists e1 s1 x1 x2 x3.(n_sight(x2) & a_out(s1) & Manner(e1,s1) & at(e1,x2) & of(x2,x3) & n_shark(x3) & Actor(e1,x1) & v_wipe(e1) & n_surfer(x1))