A group of men wearing hard hats and orange reflector vests are commemorating an event.
the men are in construction
It does not say in the first sentence that they work in construction. They could be politicians.
exists e1 e2 s1 x1 x2 x3 x4 x5 x6 x7 x8 x9.(Theme(e2,x9) & Actor(e2,x1) & v_commemorate(e2) & n_event(x9) & of(x1,x2) & Theme(e1,x4) & Actor(e1,x3) & v_wear(e1) & subset_of(x6,x4) & n_vest(x6) & of(x6,x8) & n_reflector(x8) & of(x6,x7) & n_orange(x7) & subset_of(x5,x4) & n_hat(x5) & a_hard(s1) & Theme(s1,x5) & (x2 = x3) & n_man(x2) & n_group(x1))
exists p1 x1.(n_man(x1) & exists x2.(in(x1,x2) & n_construction(x2)))