Men wearing hard hats and safety vests are working.
Men with hats on are relaxing.
Men cannot be working if they are relaxing.
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 e1 s1 x1 x2 x3.(Actor(e1,x1) & v_relax(e1) & Theme(s1,x3) & a_on(s1) & (x1 = x3) & with(x1,x2) & n_hat(x2) & n_man(x1))