A guy is doing a trick on a bike.
There is a man on a bike.
guy is a man
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 p1 x1 x2 x3.((x1 = x2) & on(x2,x3) & n_bike(x3) & n_man(x2))