The security guard is smiling.
The security guard does not seem upset or sad
When someone is smiling, they do not appear to be upset or sad.
exists e1 x1 x2.(n_guard(x1) & of(x1,x2) & n_security(x2) & Actor(e1,x1) & v_smile(e1))
exists x1 x2.(n_guard(x1) & of(x1,x2) & n_security(x2) & -exists e1 p1.((exists s1.(Theme(s1,x1) & a_upset(s1)) | exists s2.(Theme(s2,x1) & a_sad(s2))) & Topic(e1,p1) & Actor(e1,x1) & v_seem(e1)))