A young girl crying in a pretty sundress.
a girl is sad so she weeps on her sundress
All crying girls are not crying because they are sad; even if we assume that in this instance the crying child IS sad it does not necessarily mean that she weeps on her sundress.
exists e1 s1 s2 x1 x2 x3.(a_topic(x1) & in(e1,x3) & n_sundress(x3) & a_pretty(s2) & Theme(s2,x3) & Actor(e1,x2) & v_cry(e1) & (x1 = x2) & n_girl(x1) & a_young(s1) & Theme(s1,x1))
exists p1 s1 x1.(exists e1 s2 x2.(on(e1,x2) & n_sundress(x2) & a_she(s2) & Theme(s2,x2) & Actor(e1,x1) & v_weep(e1)) & n_female(x1) & so(s1,p1) & Theme(s1,x1) & a_sad(s1) & n_girl(x1))