A man on a bike that is doing a trick.
a man doing a trick on a tricycle
A man cannot be riding a bike while doing a trick on a tricycle.
exists e1 x1 x2 x3 x4.(a_topic(x1) & on(x1,x2) & Theme(e1,x4) & Actor(e1,x3) & v_do(e1) & n_trick(x4) & (x2 = x3) & n_bike(x2) & n_man(x1))
exists e1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_do(e1) & on(x3,x4) & n_tricycle(x4) & n_trick(x3) & (x1 = x2) & n_man(x1))