Construction workers are working together.
Workers are working together.
The workers refers to the construction workers and they are working together as stated in both sentences
exists e1 s1 x1 x2.(a_together(s1) & Manner(e1,s1) & Actor(e1,x1) & v_work(e1) & n_worker(x1) & of(x1,x2) & n_construction(x2))
exists e1 s1 x1.(a_together(s1) & Manner(e1,s1) & Actor(e1,x1) & v_work(e1) & n_worker(x1))