A girl on a bike stops to look back.
Girl riding bike
You can not infer she is riding.
exists e1 p1 x1 x2.(Topic(e1,p1) & Actor(e1,x1) & v_stop(e1) & exists e2 p2.(exists s1.(Theme(s1,x1) & a_back(s1)) & Topic(e2,p2) & Actor(e2,x1) & v_look(e2)) & on(x1,x2) & n_bike(x2) & n_girl(x1))
exists x1 x2 x3.(n_bike(x1) & of(x1,x3) & n_riding(x3) & (x1 = x2) & ne_nam_girl(x2) & a_topic(x1))