Two guys in blue shirts are standing on top of a construction surface doing construction work.
A couple of workers are are doing construction.
Two guys doing construction work would be sufficient to refer to them as a couple of workers.
exists e1 e2 s1 x1 x2 x3 x4 x5 x6 x7 x8.(on(e1,x3) & of(x3,x4) & Theme(e2,x7) & Actor(e2,x6) & v_do(e2) & n_work(x7) & of(x7,x8) & n_construction(x8) & (x4 = x6) & n_surface(x4) & of(x4,x5) & n_construction(x5) & n_top(x3) & Actor(e1,x1) & v_stand(e1) & in(x1,x2) & n_shirt(x2) & a_blue(s1) & Theme(s1,x2) & n_guy(x1) & card_eq_2(x1))
exists e1 e2 x1 x2 x3 x4.(Theme(e2,x4) & Actor(e2,x1) & v_do(e2) & n_construction(x4) & Actor(e1,x3) & v_be(e1) & (x1 = x3) & of(x1,x2) & n_worker(x2) & n_couple(x1))