Three men are working on a metal machine.
Three men are inside working
The metal machine is presumably inside.
exists e1 x1 x2 x3.(on(e1,x2) & n_machine(x2) & of(x2,x3) & n_metal(x3) & Actor(e1,x1) & v_work(e1) & n_man(x1) & card_eq_3(x1))
exists e1 s1 x1.(a_inside(s1) & Manner(e1,s1) & Actor(e1,x1) & v_work(e1) & n_man(x1) & card_eq_3(x1))