a young girl stands on one leg.
A young girl running on the street
The girl can be either running or she stands on one leg, but not both.
exists e1 s1 x1 x2.(on(e1,x2) & n_leg(x2) & card_eq_1(x2) & Actor(e1,x1) & v_stand(e1) & n_girl(x1) & a_young(s1) & Theme(s1,x1))
exists e1 s1 x1 x2 x3.(n_street(x3) & a_topic(x1) & on(e1,x3) & Actor(e1,x2) & v_run(e1) & (x1 = x2) & n_girl(x1) & a_young(s1) & Theme(s1,x1))