The woman is talking to someone.
A woman is talking to a friend.
Not everyone that a person talks to is a friend.
exists e1 x1 x2.(n_woman(x1) & to(e1,x2) & n_person(x2) & Actor(e1,x1) & v_talk(e1))
exists e1 x1 x2.(to(e1,x2) & n_friend(x2) & Actor(e1,x1) & v_talk(e1) & n_woman(x1))