A woman works by a sewing machine.
The woman is working under the hood of a car.
A woman can either be working under the hood of a car or a sewing machine but not both.
exists e1 e2 x1 x2.(by(e1,x2) & n_machine(x2) & Actor(e2,x2) & v_sew(e2) & Actor(e1,x1) & v_work(e1) & n_woman(x1))
exists e1 x1 x2 x3.(n_hood(x2) & n_woman(x1) & under(e1,x2) & of(x2,x3) & n_car(x3) & Actor(e1,x1) & v_work(e1))