Two construction workers are working.
Two construction workers are working through their lunchtime.
Just because construction workers are working it does not mean they are working through their lunchtime.
exists e1 x1 x2.(Actor(e1,x1) & v_work(e1) & n_worker(x1) & of(x1,x2) & n_construction(x2) & card_eq_2(x1))
exists e1 x1 x2 x3.(through(e1,x3) & n_lunchtime(x3) & of(x3,x1) & n_thing(x1) & Actor(e1,x1) & v_work(e1) & n_worker(x1) & of(x1,x2) & n_construction(x2) & card_eq_2(x1))