Two construction workers doing their job.
Two workers are on vacation.
Two workers cannot be on vacation while they are doing there jobs.
exists e1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_do(e1) & n_job(x3) & of(x3,x1) & n_thing(x1) & n_worker(x1) & of(x1,x2) & n_construction(x2) & card_eq_2(x1))
exists p1 x1.(exists x2.(on(x1,x2) & n_vacation(x2)) & n_worker(x1) & card_eq_2(x1))