A man on a motor cross bike jumping a dirt mound.
A man is riding his motor cross bike.
" is riding his motor cross bike" is a rephrasing of " on a motor cross bike".
exists e1 x1 x2 x3 x4 x5 x6 x7.(a_topic(x1) & on(x1,x2) & Theme(e1,x6) & Actor(e1,x5) & v_jump(e1) & n_mound(x6) & of(x6,x7) & n_dirt(x7) & (x2 = x5) & n_bike(x2) & of(x2,x4) & n_cross(x4) & of(x2,x3) & n_motor(x3) & n_man(x1))
exists e1 x1 x2 x3 x4.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_bike(x2) & of(x2,x4) & n_cross(x4) & of(x2,x3) & n_motor(x3) & of(x2,x1) & n_male(x1) & n_man(x1))