Men are working on scaffolding outside of a building while other men watch.
There are men watching, to make sure no one falls.
Other men who watch scaffolding are not necessarily making sure no one falls.
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 p1 x1 e1 p2 x2 x3 x4.((x1 = x2) & Topic(e1,p2) & exists e2 p3.(exists e3 p4.(-exists e4 x5.(Actor(e4,x5) & v_fall(e4) & n_one(x5)) & Topic(e3,p4) & Actor(e3,x3) & v_sure(e3)) & Topic(e2,p3) & Actor(e2,x3) & v_make(e2)) & Actor(e1,x4) & v_watch(e1) & (x2 = x4) & (x2 = x3) & n_man(x2))