A group of construction workers are working.
Guys wearing helmets.
A group of construction workers is rephrased as guys wearing helmets, since many construction workers are guys and construction workers wear helmets for safety.
exists e1 x1 x2 x3.(Actor(e1,x1) & v_work(e1) & of(x1,x2) & n_worker(x2) & of(x2,x3) & n_construction(x3) & n_group(x1))
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_helmet(x3) & (x1 = x2) & n_guy(x1))