Welders working at night with sparks flying.
The workers need sunglasses on this bright day.
there can be no bright sun at night
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 s1 x1 x2 x3.(n_day(x3) & a_bright(s1) & Theme(s1,x3) & n_worker(x1) & on(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_need(e1) & n_sunglass(x2))