Little girl skis on slope.
Some little girls are preparing to ski on a slope
If the girl skis on slope then they are done preparing to ski.
exists s1 x1 x2 x3.(a_topic(x1) & on(x1,x3) & n_slope(x3) & n_ski(x1) & of(x1,x2) & n_girl(x2) & a_little(s1) & Theme(s1,x1))
exists e1 p1 s1 x1.(Topic(e1,p1) & Actor(e1,x1) & v_prepare(e1) & exists e2 x2.(on(e2,x2) & n_slope(x2) & Actor(e2,x1) & v_ski(e2)) & n_girl(x1) & a_little(s1) & Theme(s1,x1))