A group of workers begin to put up the metal frame of a future building.
The frame is made of metal.
Having a metal frame is having a frame made of metal. This aspect is restated, leaving out the group of workers' presence.
exists e1 p1 x1 x2 x3 x4.(n_frame(x3) & of(x3,x4) & n_metal(x4) & Topic(e1,p1) & Actor(e1,x1) & v_begin(e1) & exists e2 s1 s2 x5.(a_up(s2) & Manner(e2,s2) & Theme(e2,x3) & Actor(e2,x1) & v_put(e2) & of(x3,x5) & n_building(x5) & a_future(s1) & Theme(s1,x5)) & of(x1,x2) & n_worker(x2) & n_group(x1))
exists e1 x1 x2.(n_frame(x1) & of(e1,x2) & n_metal(x2) & Theme(e1,x1) & v_make(e1))