A man sitting on a boat being watched by police officers.
A woman is sitting on the boat with the police officers.
A man is not a woman and sitting with police officers doesn't mean you're being watched by them.
exists e1 e2 x1 x2 x3 x4 x5 x6.(a_topic(x1) & on(e1,x3) & Actor(e2,x5) & n_officer(x5) & of(x5,x6) & n_police(x6) & Theme(e2,x4) & v_watch(e2) & (x3 = x4) & n_boat(x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_man(x1))
exists e1 x1 x2 x3 x4.(n_officer(x3) & of(x3,x4) & n_police(x4) & n_boat(x2) & with(e1,x3) & on(e1,x2) & Actor(e1,x1) & v_sit(e1) & n_woman(x1))