A young girl sits on the edge of a sink.
a girl poses for her mother
A girl could be sitting on the sink by herself without her mother even seeing, or to do anything besides pose.
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 x1 x2.(for(e1,x2) & n_mother(x2) & of(x2,x1) & n_female(x1) & Actor(e1,x1) & v_pose(e1) & n_girl(x1))