A construction worker is working on a support beam on a building.
A construction worker welds a support beam for a build that had recently shifted.
Sentence one says the construction worker is working on support beam it does not infer he's welding or that the build had recently shifted.
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 e3 e2 s1 x1 x2 x3 x4 x5 x6 x7.(that(e2,e3) & a_recently(s1) & Manner(e3,s1) & Actor(e3,x7) & v_shift(e3) & n_thing(x7) & Actor(e2,x1) & v_build(e2) & Theme(e1,x4) & Actor(e1,x3) & v_weld(e1) & for(x4,x6) & n_a(x6) & n_beam(x4) & of(x4,x5) & n_support(x5) & (x1 = x3) & n_worker(x1) & of(x1,x2) & n_construction(x2))