A young girl sits on the edge of a sink.
A little girl sits on a sink edge waiting to wash dishes.
A girl could sit on the sink for any number of reasons besides waiting to wash dishes.
exists e1 s1 x1 x2 x3.(n_edge(x2) & on(e1,x2) & of(x2,x3) & n_sink(x3) & Actor(e1,x1) & v_sit(e1) & n_girl(x1) & a_young(s1) & Theme(s1,x1))
exists e1 e2 p1 s1 s2 x1 x2.(for(e1,e2) & Topic(e2,p1) & Actor(e2,x1) & v_wait(e2) & exists e3 x3.(Theme(e3,x3) & Actor(e3,x1) & v_wash(e3) & n_dish(x3)) & on(e1,x2) & n_edge(x2) & a_sink(s2) & Theme(s2,x2) & Actor(e1,x1) & v_sit(e1) & n_girl(x1) & a_little(s1) & Theme(s1,x1))