A construction worker working by painting a subway.
A worker is cleaning bird poop off of a building.
You can not be painting and cleaning at the same time. A subway is not a building.
exists e1 e2 x1 x2 x3 x4.(a_topic(x1) & by(e1,e2) & Theme(e2,x4) & Actor(e2,x3) & v_paint(e2) & n_subway(x4) & Actor(e1,x3) & v_work(e1) & (x1 = x3) & n_worker(x1) & of(x1,x2) & n_construction(x2))
exists e1 x1 x2 x3 x4.(of(e1,x4) & n_building(x4) & r_off(e1) & Theme(e1,x2) & Actor(e1,x1) & v_clean(e1) & n_poop(x2) & of(x2,x3) & n_bird(x3) & n_worker(x1))