Two girls climbing on a fence.
The girls fell while climbing a fence.
Two girls climbing a fence does not imply that they fell.
exists e1 x1 x2 x3.(a_topic(x1) & on(e1,x3) & n_fence(x3) & Actor(e1,x2) & v_climb(e1) & (x1 = x2) & n_girl(x1) & card_eq_2(x1))
exists e2 e1 x1 x2.(n_girl(x1) & while(e1,e2) & Theme(e2,x2) & Actor(e2,x1) & v_climb(e2) & n_fence(x2) & Actor(e1,x1) & v_fall(e1))