Construction workers are working together to carry a piece of equipment.
Three construction workers demonstrate cooperation.
You cannot say there are three construction workers, as that is not known.
exists e1 p1 s1 x1 x2 x3 x4.(Topic(e1,p1) & exists e2 x5 x6.(Theme(e2,x5) & Actor(e2,x1) & v_carry(e2) & of(x5,x6) & n_equipment(x6) & n_piece(x5)) & a_together(s1) & Manner(e1,s1) & Actor(e1,x3) & v_work(e1) & n_worker(x3) & of(x3,x4) & n_construction(x4) & n_worker(x1) & of(x1,x2) & n_construction(x2))
exists e1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_demonstrate(e1) & n_cooperation(x3) & n_worker(x1) & of(x1,x2) & n_construction(x2) & card_eq_3(x1))