A restaurant worker is cleaning a seat.
The restaurant employee was sick and could not go to work.
the employee would not be cleaning at work if not at work.
exists e1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_clean(e1) & n_seat(x3) & n_worker(x1) & of(x1,x2) & n_restaurant(x2))
exists s1 x1 x2 x3.(n_employee(x1) & of(x1,x3) & n_restaurant(x3) & of(x1,x2) & n_restaurant(x2) & -exists e1 p1.(exists e2 x4.(to(e2,x4) & n_work(x4) & Actor(e2,x1) & v_go(e2)) & Topic(e1,p1) & Actor(e1,x1) & v_could(e1)) & Theme(s1,x1) & a_sick(s1))