Two constructions workers sit on a beam taking a break.
Two office workers sit on a table taking a break.
Construction workers do not have to be office workers.  A beam is not a table.
exists e1 e2 x1 x2 x3 x4.(for(e1,e2) & Theme(e2,x4) & Actor(e2,x1) & v_take(e2) & n_break(x4) & on(e1,x3) & n_beam(x3) & Actor(e1,x1) & v_sit(e1) & n_worker(x1) & of(x1,x2) & n_construction(x2) & card_eq_2(x1))
exists e1 e2 x1 x2 x3 x4.(for(e1,e2) & Theme(e2,x4) & Actor(e2,x1) & v_take(e2) & n_break(x4) & on(e1,x3) & n_table(x3) & Actor(e1,x1) & v_sit(e1) & n_worker(x1) & of(x1,x2) & n_office(x2) & card_eq_2(x1))