Two people talk while sitting by a desk.
Two people are standing at the water cooler.
Sitting cannot be done while standing.
exists e2 e1 x1 x2.(while(e1,e2) & by(e2,x2) & n_desk(x2) & Actor(e2,x1) & v_sit(e2) & Actor(e1,x1) & v_talk(e1) & n_people(x1) & card_eq_2(x1))
exists e1 x1 x2 x3.(n_cooler(x2) & of(x2,x3) & n_water(x3) & at(e1,x2) & Actor(e1,x1) & v_stand(e1) & n_people(x1) & card_eq_2(x1))