A person doing a trick on a bike
A pro skater is performing.
Is the skater performing or doing trick on a bike
exists e1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_do(e1) & on(x3,x4) & n_bike(x4) & n_trick(x3) & (x1 = x2) & n_person(x1))
exists e1 s1 x1.(Actor(e1,x1) & v_perform(e1) & n_skater(x1) & a_pro(s1) & Theme(s1,x1))