Welders working at night with sparks flying.
At nght, the welders work.
working with sparks flying implies they are working.
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 x1 x2 x3 x4 x5.(n_work(x4) & of(x4,x5) & n_welder(x5) & at(x1,x2) & subset_of(x4,x2) & subset_of(x3,x2) & n_nght(x3) & n_event(x1))