A child looks over her mother's shoulder.
A child looks for his father.
A child looking over her mother's shoulder is not necessarily looking for his father.
exists e1 x1 x2 x3.(over(e1,x3) & n_shoulder(x3) & of(x3,x2) & n_mother(x2) & of(x2,x1) & n_female(x1) & Actor(e1,x1) & v_look(e1) & n_child(x1))
exists e1 x1 x2.(for(e1,x2) & n_father(x2) & of(x2,x1) & n_male(x1) & Actor(e1,x1) & v_look(e1) & n_child(x1))