Two people stand before an ambulance.
Two people are riding in an ambulance.
Riding is nearly opposite of two people that stand.
exists e1 x1 x2.(before(e1,x2) & n_ambulance(x2) & Actor(e1,x1) & v_stand(e1) & n_people(x1) & card_eq_2(x1))
exists e1 x1 x2.(in(e1,x2) & n_ambulance(x2) & Actor(e1,x1) & v_ride(e1) & n_people(x1) & card_eq_2(x1))