A woman on her cellphone is walking in a park.
A woman is talking to her son on her cellphone.
Just because a woman is talking on the cell phone does not mean she is talking to her son.
exists e1 x1 x2 x3.(in(e1,x3) & n_park(x3) & Actor(e1,x1) & v_walk(e1) & on(x1,x2) & n_cellphone(x2) & of(x2,x1) & n_female(x1) & n_woman(x1))
exists e1 x1 x2 x3.(on(e1,x3) & n_cellphone(x3) & of(x3,x1) & n_female(x1) & n_female(x1) & to(e1,x2) & n_son(x2) & of(x2,x1) & Actor(e1,x1) & v_talk(e1) & n_woman(x1))