A woman is talking on a cellphone.
a woman is listening to her voicemail
A woman talking on a cellphone might not necessarily be listening to her voicemail.
exists e1 x1 x2.(on(e1,x2) & n_cellphone(x2) & Actor(e1,x1) & v_talk(e1) & n_woman(x1))
exists e1 x1 x2.(to(e1,x2) & n_voicemail(x2) & of(x2,x1) & n_female(x1) & Actor(e1,x1) & v_listen(e1) & n_woman(x1))