Men are working on scaffolding outside of a building while other men watch.
the men work in construction.
The fact that men are working on building scaffolding doesn't imply they work in construction.
exists e1 e3 e2 x1 x2 x3 x4 x5 x6.(Theme(e3,x6) & Actor(e3,x1) & v_watch(e3) & n_thing(x6) & on(e1,e2) & while(e2,x5) & -(x5 = x1) & n_man(x1) & n_man(x1) & n_man(x5) & of(e2,x4) & n_building(x4) & r_outside(e2) & Actor(e2,x3) & v_scaffold(e2) & Actor(e1,x2) & v_work(e1) & (x1 = x2))
exists e1 x1 x2.(n_man(x1) & in(e1,x2) & n_construction(x2) & Actor(e1,x1) & v_work(e1))