A black man sitting inside a postal drop box.
the drop box is empty
When a man is inside something, it's not empty.
exists e1 s1 s2 x1 x2 x3 x4.(a_topic(x1) & inside(e1,x3) & n_box(x3) & of(x3,x4) & n_drop(x4) & a_postal(s2) & Theme(s2,x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_man(x1) & a_black(s1) & Theme(s1,x1))
exists s1 x1 x2.(n_box(x1) & of(x1,x2) & n_drop(x2) & Theme(s1,x1) & a_empty(s1))