A family is walking through a building and a man sits on a ledge inside the building.
The group walked through the building.
Walked through the building is a rephrase of is walking through a building.
exists e2 e1 x1 x2 x3 x4.(inside(e2,x2) & n_building(x2) & n_building(x2) & on(e2,x4) & n_ledge(x4) & Actor(e2,x3) & v_sit(e2) & n_man(x3) & through(e1,x2) & Actor(e1,x1) & v_walk(e1) & n_family(x1))
exists e1 x1 x2.(n_building(x2) & n_group(x1) & through(e1,x2) & Actor(e1,x1) & v_walk(e1))