Men wearing hard hats and safety vests are working.
There are construction workers working.
Construction workers are known as such by wearing hard hats and safety vests.
exists e1 e2 s1 x1 x2 x3 x4 x5.(Actor(e2,x1) & v_work(e2) & subset_of(x4,x1) & n_vest(x4) & of(x4,x5) & n_safety(x5) & subset_of(x2,x1) & n_hat(x2) & a_hard(s1) & Theme(s1,x2) & Actor(e1,x2) & v_wear(e1) & of(x2,x3) & n_man(x3))
exists p1 x1 e1 x2 x3 x4.((x1 = x2) & Actor(e1,x4) & v_work(e1) & (x2 = x4) & n_worker(x2) & of(x2,x3) & n_construction(x3))