Men in orange vests and hard hats.
People at a construction site walking around a half built house.
Just because men are in orange vests and hard hats it does not mean they are at a construction site.  People do not have to be men.
exists s1 x1 x2 x3 x4 x5.(a_topic(x1) & in(x1,x2) & n_hat(x5) & a_hard(s1) & Theme(s1,x5) & n_vest(x4) & subset_of(x5,x2) & subset_of(x4,x2) & of(x2,x3) & n_orange(x3) & n_man(x1))
exists e1 e2 x1 x2 x3 x4 x5 x6.(a_topic(x1) & at(x1,x2) & around(e1,x5) & n_house(x5) & Theme(e2,x5) & v_build(e2) & of(x5,x6) & n_half(x6) & Actor(e1,x4) & v_walk(e1) & (x2 = x4) & n_site(x2) & of(x2,x3) & n_construction(x3) & n_people(x1))