Two girls are standing behind another girl.
Two girls are preparing to push a third girl.
Just because the Two girls are standing behind another girl does not mean they are about to push a third girl.
exists e1 x1 x2.(behind(e1,x2) & n_girl(x2) & -(x2 = x1) & n_girl(x1) & n_girl(x1) & Actor(e1,x1) & v_stand(e1) & card_eq_2(x1))
exists e1 p1 x1.(Topic(e1,p1) & Actor(e1,x1) & v_prepare(e1) & exists e2 s1 x2.(Theme(e2,x2) & Actor(e2,x1) & v_push(e2) & n_girl(x2) & a_third(s1) & Theme(s1,x2)) & n_girl(x1) & card_eq_2(x1))