A man speaking at a conference.
The man is wearing black shoes.
Not all men are wearing black shoes.
exists x1 x2 x3.(a_topic(x1) & at(x1,x3) & n_conference(x3) & n_speaking(x1) & of(x1,x2) & n_man(x2))
exists e1 s1 x1 x2.(n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_wear(e1) & n_shoe(x2) & a_black(s1) & Theme(s1,x2))