Three construction workers are working on a scaffolding.
Three workers are on a scaffolding
construction workers are a  particular type of workers
exists e1 x1 x2 x3.(on(e1,x3) & n_scaffolding(x3) & Actor(e1,x1) & v_work(e1) & n_worker(x1) & of(x1,x2) & n_construction(x2) & card_eq_3(x1))
exists p1 x1.(exists x2.(on(x1,x2) & n_scaffolding(x2)) & n_worker(x1) & card_eq_3(x1))