Welders working at night with sparks flying.
Workers using metal and fire.
with sparks implies they are using metal and fire.
exists e1 e2 x1 x2 x3.(Actor(e2,x3) & v_fly(e2) & with(e1,x3) & n_sparks(x3) & at(e1,x2) & n_night(x2) & Actor(e1,x1) & v_work(e1) & n_welder(x1))
exists e1 x1 x2 x3 x4.(Theme(e1,x2) & Actor(e1,x1) & v_use(e1) & n_fire(x4) & n_metal(x3) & subset_of(x4,x2) & subset_of(x3,x2) & n_worker(x1))