Three men are working on a welding job.
Some men are repairing a tanker ship.
Just because three men are welding doesn't mean they are specifically repairing a tanker ship.
exists e1 s1 x1 x2.(on(e1,x2) & n_job(x2) & a_welding(s1) & Theme(s1,x2) & Actor(e1,x1) & v_work(e1) & n_man(x1) & card_eq_3(x1))
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_repair(e1) & n_ship(x2) & of(x2,x3) & n_tanker(x3) & n_man(x1))