A homeless man standing in a construction site.
Nobody is standing
The man is standing. Thus, it can't be true that nobody is standing.
exists s1 x1 x2 x3 x4.(a_topic(x1) & in(x1,x3) & n_site(x3) & of(x3,x4) & n_construction(x4) & n_standing(x1) & of(x1,x2) & n_man(x2) & a_homeless(s1) & Theme(s1,x1))
-exists e1 x1.(Actor(e1,x1) & v_stand(e1) & n_person(x1))