A man talks to a mounted policeman.
The police man is wearing a hat
Not all mounted policeman are wearing hats all of the time.
exists e1 x1 x2 x3.(a_topic(x1) & to(x1,x3) & n_policeman(x3) & Theme(e1,x3) & v_mount(e1) & n_talk(x1) & of(x1,x2) & n_man(x2))
exists e1 x1 x2 x3.(n_man(x1) & of(x1,x2) & n_police(x2) & Theme(e1,x3) & Actor(e1,x1) & v_wear(e1) & n_hat(x3))