Two ladies are walking on the road.
A woman and her sister are driving in a car.
If two ladies are walking on the road, then they can't be driving a car. They are on foot.
exists e1 x1 x2.(n_road(x2) & on(e1,x2) & Actor(e1,x1) & v_walk(e1) & n_lady(x1) & card_eq_2(x1))
exists e1 x1 x2 x3 x4.(in(e1,x4) & n_car(x4) & Actor(e1,x1) & v_drive(e1) & subset_of(x3,x1) & n_sister(x3) & of(x3,x2) & n_female(x2) & subset_of(x2,x1) & n_woman(x2))