Worker at computer in empty office.
The person is a secretary.
A worker doesn't necessarily mean secretary.
exists s1 s2 x1 x2.(ne_nam_worker(s1) & a_topic(s1) & at(s1,x1) & in(x1,x2) & n_office(x2) & a_empty(s2) & Theme(s2,x2) & n_computer(x1))
exists p1 x1.(n_person(x1) & exists x2.((x1 = x2) & n_secretary(x2)))