A woman sits on a green bench while reading a book.
Nobody is sitting
If a woman sits, one cannot say that nobody is sitting.
exists e2 e1 s1 x1 x2 x3.(while(e1,e2) & Theme(e2,x3) & Actor(e2,x1) & v_read(e2) & n_book(x3) & on(e1,x2) & n_bench(x2) & a_green(s1) & Theme(s1,x2) & Actor(e1,x1) & v_sit(e1) & n_woman(x1))
-exists e1 x1.(Actor(e1,x1) & v_sit(e1) & n_person(x1))