Two construction workers working on a building.
Workers building a school.
the building doesn't have to be a school
exists e1 x1 x2 x3.(on(e1,x3) & n_building(x3) & Actor(e1,x1) & v_work(e1) & n_worker(x1) & of(x1,x2) & n_construction(x2) & card_eq_2(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_build(e1) & n_school(x2) & n_worker(x1))