A man is smiling while standing behind a podium.
man smiles
A man that smiles indicates the man is smiling.
exists e2 e1 x1 x2.(while(e1,e2) & behind(e2,x2) & n_podium(x2) & Actor(e2,x1) & v_stand(e2) & Actor(e1,x1) & v_smile(e1) & n_man(x1))
exists x1 x2.(n_smile(x1) & of(x1,x2) & n_man(x2) & a_topic(x1))