Young girls are practicing dance.
Young girls are dancing.
practicing dance. implies that the girls are indeed dancing., as these are essentially the same activity
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_practice(e1) & n_dance(x2) & n_girl(x1) & a_young(s1) & Theme(s1,x1))
exists e1 s1 x1.(Actor(e1,x1) & v_dance(e1) & n_girl(x1) & a_young(s1) & Theme(s1,x1))