This man is riding a dirt bike on a dirt track.
The man is driving a monster truck over old cars in an arena.
Dirt bike is different then monster truck.
exists e1 x1 x2 x3 x4 x5.(n_man(x1) & on(e1,x4) & n_track(x4) & of(x4,x5) & n_dirt(x5) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_bike(x2) & of(x2,x3) & n_dirt(x3))
exists e1 s1 x1 x2 x3 x4 x5.(n_man(x1) & in(e1,x5) & n_arena(x5) & Theme(e1,x2) & Actor(e1,x1) & v_drive(e1) & over(x2,x4) & n_car(x4) & a_old(s1) & Theme(s1,x4) & n_truck(x2) & of(x2,x3) & n_monster(x3))