A man is performing a trick on a bicycle at a rocky beach.
A man is riding a bike at the beach.
A man performing a trick on a bicycle means he is riding a bike.
exists e1 s1 x1 x2 x3 x4.(at(e1,x4) & n_beach(x4) & a_rocky(s1) & Theme(s1,x4) & on(e1,x3) & n_bicycle(x3) & Theme(e1,x2) & Actor(e1,x1) & v_perform(e1) & n_trick(x2) & n_man(x1))
exists e1 x1 x2 x3.(n_beach(x3) & at(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_bike(x2) & n_man(x1))