The man is welding the iron.
This guy went to trade school.
Welding iron does not imply that one went to trade school.
exists e1 x1 x2.(n_iron(x2) & n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_weld(e1))
exists e1 p1 x1.(n_guy(x1) & Topic(e1,p1) & Actor(e1,x1) & v_go(e1) & exists e2 x2.(Theme(e2,x2) & Actor(e2,x1) & v_trade(e2) & n_school(x2)))