A man is on a ladder which is leaning against a building.
A man is doing repairs on a building.
The man could be using the ladder for any reason, not just for doing repairs.
exists p1 x1.(exists e1 x2 x3 x4.(on(x1,x2) & against(e1,x4) & n_building(x4) & Actor(e1,x3) & v_lean(e1) & (x2 = x3) & n_ladder(x2)) & n_man(x1))
exists e1 x1 x2 x3.(on(e1,x3) & n_building(x3) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & n_repair(x2) & n_man(x1))