A construction worker is working on a support beam on a building.
A support beam is being worked on.
worker is working on a support beam is another way to say a support beam is being worked on.
exists e1 x1 x2 x3 x4 x5.(on(e1,x3) & on(x3,x5) & n_building(x5) & n_beam(x3) & of(x3,x4) & n_support(x4) & Actor(e1,x1) & v_work(e1) & n_worker(x1) & of(x1,x2) & n_construction(x2))
exists e1 s1 x1 x2.(a_on(s1) & Manner(e1,s1) & Theme(e1,x1) & v_work(e1) & n_beam(x1) & of(x1,x2) & n_support(x2))