Several men are working in a shower of metal sparks.
Several men are welders.
Working in a shower of metal sparks does not imply that the men are welders.
exists e1 s1 x1 x2 x3 x4.(in(e1,x2) & of(x2,x3) & n_sparks(x3) & of(x3,x4) & n_metal(x4) & n_shower(x2) & Actor(e1,x1) & v_work(e1) & n_man(x1) & a_several(s1) & Theme(s1,x1))
exists p1 s1 x1.(exists x2.((x1 = x2) & n_welder(x2)) & n_man(x1) & a_several(s1) & Theme(s1,x1))