Man seated on a bus looking out the window at pedestrians.
Man riding bus notices his friend outside walking on the street.
A man looking at pedestrians does not mean he notices his friend.
exists e1 e2 s1 x1 x2 x3 x4.(n_window(x4) & for(e1,e2) & Time(e2,x4) & a_out(s1) & Manner(e2,s1) & at(e2,x3) & n_pedestrian(x3) & Actor(e2,x1) & v_look(e2) & on(e1,x2) & n_bus(x2) & Actor(e1,x1) & v_seat(e1) & n_man(x1))
(x)