A large crane with workers beside it at night.
Nobody by a crane
There can be either workers or nobody by a crane.
exists s1 x1 x2 x3.(a_topic(x1) & at(x1,x3) & n_night(x3) & beside(x1,x2) & n_thing(x2) & with(x1,x2) & n_worker(x2) & n_crane(x1) & a_large(s1) & Theme(s1,x1))
-exists x1 x2.(a_topic(x1) & by(x1,x2) & n_crane(x2) & n_person(x1))