The security guard is smiling.
The security guard is talking to someone.
Just because he is smiling does not mean he is talking to someone.
exists e1 x1 x2.(n_guard(x1) & of(x1,x2) & n_security(x2) & Actor(e1,x1) & v_smile(e1))
exists e1 x1 x2 x3.(n_guard(x1) & of(x1,x2) & n_security(x2) & to(e1,x3) & n_person(x3) & Actor(e1,x1) & v_talk(e1))