Some machines have an automatic thread-trimmer to do this step; if not, then the threads must be cut and the finished work put in an appropriate pile to be tied together when all the pieces of the bundle have been finished.
( ( ( ( ( Some machines ) ( have ( an ( automatic ( thread-trimmer ( to ( do ( this step ) ) ) ) ) ) ) ) ; ) ( ( ( ( if not ) ( , ( ( then ( the threads ) ) ( must ( be cut ) ) ) ) ) and ) ( ( the ( finished work ) ) ( ( put ( in ( an ( appropriate pile ) ) ) ) ( to ( be ( ( tied together ) ( when ( ( ( all ( the pieces ) ) ( of ( the bundle ) ) ) ( have ( been finished ) ) ) ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (DT Some) (NNS machines)) (VP (VBP have) (NP (DT an) (JJ automatic) (NN thread-trimmer) (S (VP (TO to) (VP (VB do) (NP (DT this) (NN step)))))))) (: ;) (S (S (FRAG (IN if) (RB not)) (, ,) (NP (NP (RB then)) (NP (DT the) (NNS threads))) (VP (MD must) (VP (VB be) (VP (VBN cut))))) (CC and) (S (NP (DT the) (VBN finished) (NN work)) (VP (VBD put) (PP (IN in) (NP (DT an) (JJ appropriate) (NN pile))) (S (VP (TO to) (VP (VB be) (VP (VBN tied) (ADVP (RB together)) (SBAR (WHADVP (WRB when)) (S (NP (NP (PDT all) (DT the) (NNS pieces)) (PP (IN of) (NP (DT the) (NN bundle)))) (VP (VBP have) (VP (VBN been) (VP (VBN finished))))))))))))) (. .)))
Every machine has an automatic thread-trimmer to do this step.
( ( Every machine ) ( ( has ( an ( automatic ( thread-trimmer ( to ( do ( this step ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT Every) (NN machine)) (VP (VBZ has) (NP (DT an) (JJ automatic) (NN thread-trimmer) (S (VP (TO to) (VP (VB do) (NP (DT this) (NN step))))))) (. .)))