A wakeboarder is performing a trick on a rail.
A wakeboarder learns a new trick
A wakeboarder performing a trick would not always be performing a new trick.
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.(Theme(e1,x2) & Actor(e1,x1) & v_learn(e1) & n_trick(x2) & a_new(s1) & Theme(s1,x2) & n_wakeboarder(x1))