Workers erect a pavilion for an event in the park.
Workers build a stage for the outdoor concert.
Workers are building a pavillon, not a stage.
exists e1 x1 x2 x3 x4.(n_park(x4) & in(e1,x4) & for(e1,x3) & n_event(x3) & Theme(e1,x2) & Actor(e1,x1) & v_erect(e1) & n_pavilion(x2) & n_worker(x1))
exists e1 s1 x1 x2 x3.(n_concert(x3) & a_outdoor(s1) & Theme(s1,x3) & for(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_build(e1) & n_stage(x2) & n_worker(x1))