A group of workers, some standing on a wall, mill about a building site with a pile of lightly-colored wood nearby.
The workers are repairing the wall.
Group of workers in sentence 1 may not be repairing walls, as it is mentioned they are standing on a wall.
exists s1 s2 x1 x2 x3 x4 x5 x6 x7 x8 x9.(a_topic(x1) & of(x1,x2) & rel(x2,x3) & on(x3,x4) & about(x4,x6) & r_nearby(x6) & with(x6,x8) & of(x8,x9) & n_wood(x9) & a_lightly-colored(s2) & Theme(s2,x9) & n_pile(x8) & n_site(x6) & of(x6,x7) & n_building(x7) & n_mill(x4) & a_,(s1) & Theme(s1,x4) & of(x4,x5) & n_wall(x5) & n_standing(x3) & n_worker(x2) & n_group(x1))
exists e1 x1 x2.(n_wall(x2) & n_worker(x1) & Theme(e1,x2) & Actor(e1,x1) & v_repair(e1))