A man sits on a motorcycle and a woman is on the back.
a man is on the road
A motorcycle does not have to be on the road.
exists e1 p1 x1 x2 x3 x4.(n_back(x4) & on(x3,x4) & n_woman(x3) & on(e1,x2) & n_motorcycle(x2) & Actor(e1,x1) & v_sit(e1) & n_man(x1))
exists p1 x1 x2.(n_road(x2) & on(x1,x2) & n_man(x1))