Two workers are wearing hard hats while one of them begins to descend into a floor hatch.
Workers are getting ready to work underground.
Workers wearing hard hats are not necessarily getting ready to work underground.
exists e1 p1 s1 x1 x2.(exists e2 p2 x3.(Topic(e2,p2) & Actor(e2,x3) & v_begin(e2) & exists e3 x4 x5.(into(e3,x4) & n_hatch(x4) & of(x4,x5) & n_floor(x5) & Actor(e3,x3) & v_descend(e3)) & of(x3,x1) & n_thing(x3) & card_eq_1(x3)) & n_thing(x1) & while(e1,p1) & Theme(e1,x2) & Actor(e1,x1) & v_wear(e1) & n_hat(x2) & a_hard(s1) & Theme(s1,x2) & n_worker(x1) & card_eq_2(x1))
exists e1 p1 x1.(exists p2 s1.(Topic(s1,p2) & Actor(s1,x1) & a_ready(s1) & exists e2 s2.(a_underground(s2) & Manner(e2,s2) & Actor(e2,x1) & v_work(e2))) & Topic(e1,p1) & Actor(e1,x1) & v_get(e1) & n_worker(x1))