A woman and boy sit on a police motorcycle.
A woman and boy on a police motorcyle being protected by the police.
It is not necessary that people sitting on a police motorcycle are being protected by the police.
exists e1 x1 x2 x3 x4 x5.(on(e1,x4) & n_motorcycle(x4) & of(x4,x5) & n_police(x5) & Actor(e1,x1) & v_sit(e1) & n_boy(x3) & n_woman(x2) & subset_of(x3,x1) & subset_of(x2,x1))
exists e1 s1 x1 x2 x3 x4 x5.(a_topic(s1) & on(s1,x3) & Actor(e1,x4) & n_police(x4) & n_police(x4) & Theme(e1,x5) & v_protect(e1) & (x3 = x5) & n_motorcyle(x3) & of(x3,x4) & n_boy(x2) & n_woman(x1) & subset_of(x2,s1) & subset_of(x1,s1))