A guy is doing a trick on a bike.
Bicyclist performing a trick
A guy is a bicyclist, and doing a trick is performing a trick.
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & on(x2,x3) & n_bike(x3) & n_trick(x2) & n_guy(x1))
exists e1 x1 x2.(ne_nam_bicyclist(x1) & Theme(e1,x2) & Actor(e1,x1) & v_perform(e1) & n_trick(x2))