Two dogs fighting in the street.
Two dogs are fighting in front of a crowd.
In the first sentence the two dogs are not in front of a crowd.
exists e1 x1 x2 x3.(n_street(x3) & a_topic(x1) & in(e1,x3) & Actor(e1,x2) & v_fight(e1) & (x1 = x2) & n_dog(x1) & card_eq_2(x1))
exists e1 x1 x2 x3.(in(e1,x2) & of(x2,x3) & n_crowd(x3) & n_front(x2) & Actor(e1,x1) & v_fight(e1) & n_dog(x1) & card_eq_2(x1))