A guy doing a wallride on his bike
A man is doing a trick on a bike.
A man is doing  a wallride trick on his 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) & of(x4,x1) & n_male(x1) & n_wallride(x3) & (x1 = x2) & n_guy(x1))
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & on(x2,x3) & n_bike(x3) & n_trick(x2) & n_man(x1))