A boy on a scooter.
A boy on a scooter while his friends watch
No way to know that his friends watch.
exists x1 x2.(a_topic(x1) & on(x1,x2) & n_scooter(x2) & n_boy(x1))
exists p1 p2 p3 x1 x2 x3.(for(p1,x1) & on(p1,x2) & n_scooter(x2) & exists x4.n_event(x4) & exists e1.(Actor(e1,x3) & v_watch(e1)) & n_friend(x3) & of(x3,x1) & n_male(x1) & while(p2,p3) & n_boy(x1))