A man in work clothes is holding a chain.
a worker about to chain up his bike
Just because a man is in work clothes does not he is a worker .A man holding a chain does not mean he is chaining up his bike.
exists e1 x1 x2 x3 x4.(Theme(e1,x4) & Actor(e1,x1) & v_hold(e1) & n_chain(x4) & in(x1,x2) & n_clothes(x2) & of(x2,x3) & n_work(x3) & n_man(x1))
exists s1 x1 x2 x3.(a_topic(x1) & about(x1,x2) & up(x2,x3) & n_bike(x3) & of(x3,x1) & n_male(x1) & n_chain(x2) & a_to(s1) & Theme(s1,x2) & n_worker(x1))