A man standing on some scaffolding is trying to position a ladder.
The man is using the ladder to defend himself against attackers.
A man cannot be standing on scaffolding and using the ladder simultaneously.
exists e1 e2 p1 x1 x2 x3.(Topic(e2,p1) & Actor(e2,x1) & v_try(e2) & exists e3 x4.(Theme(e3,x4) & Actor(e3,x1) & v_position(e3) & n_ladder(x4)) & on(e1,x3) & n_scaffolding(x3) & Actor(e1,x2) & v_stand(e1) & (x1 = x2) & n_man(x1))
exists e1 p1 x1 x2.(n_male(x2) & n_ladder(x2) & n_man(x1) & Theme(e1,p1) & Recipient(e1,x2) & Actor(e1,x1) & v_use(e1) & exists e2 x3.(against(e2,x3) & n_attacker(x3) & Theme(e2,x2) & Actor(e2,x1) & v_defend(e2)))