bound in fetters, they work continually without being allowed any rest by night or day.
( ( bound ( in fetters ) ) ( , ( they ( ( ( work continually ) ( without ( being ( ( allowed ( any rest ) ) ( by ( ( night or ) day ) ) ) ) ) ) . ) ) ) )
(ROOT (S (S (VP (VBN bound) (PP (IN in) (NP (NNS fetters))))) (, ,) (NP (PRP they)) (VP (VBP work) (ADVP (RB continually)) (PP (IN without) (S (VP (VBG being) (VP (VBN allowed) (NP (DT any) (NN rest)) (PP (IN by) (NP (NN night) (CC or) (NN day)))))))) (. .)))
They worked continuously without any rest at all. 
( They ( ( ( worked continuously ) ( without ( ( any rest ) ( at all ) ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VBD worked) (ADVP (RB continuously)) (PP (IN without) (NP (NP (DT any) (NN rest)) (ADVP (IN at) (DT all))))) (. .)))