A person sitting on a hill outside.
A man is sitting outside watching the sunset.
A person sitting on a hill outside is not necessarily a man outside watching the sunset.
exists e1 x1 x2 x3 x4.(a_topic(x1) & on(e1,x3) & n_outside(x3) & of(x3,x4) & n_hill(x4) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_person(x1))
exists e2 e1 p1 x1 x2.(n_sunset(x2) & for(e1,e2) & Theme(e2,x2) & Actor(e2,x1) & v_watch(e2) & exists s1.(Theme(s1,x1) & a_outside(s1)) & Topic(e1,p1) & Actor(e1,x1) & v_sit(e1) & n_man(x1))