Someone is trying to detach the boy from a ladder.
The boy stood tall on the ladder.
If someone is trying to detach the boy from a ladder, he could not have stood tall on it because it would be easier to detach him.
exists e1 p1 x1 x2.(n_boy(x2) & Topic(e1,p1) & Actor(e1,x1) & v_try(e1) & exists e2 x3.(from(e2,x3) & n_ladder(x3) & Theme(e2,x2) & Actor(e2,x1) & v_detach(e2)) & n_person(x1))
exists e1 p1 x1 x2.(n_ladder(x2) & n_boy(x1) & on(e1,x2) & exists s1.(Theme(s1,x1) & a_tall(s1)) & Topic(e1,p1) & Actor(e1,x1) & v_stand(e1))