Sir, they're going to want to know what to do.
( Sir ( , ( they ( ( 're ( going ( to ( want ( to ( know ( what ( to do ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (NP (NNP Sir)) (, ,) (NP (PRP they)) (VP (VBP 're) (VP (VBG going) (S (VP (TO to) (VP (VB want) (S (VP (TO to) (VP (VB know) (SBAR (WHNP (WP what)) (S (VP (TO to) (VP (VB do))))))))))))) (. .)))
They're going to want to know how to react.
( They ( ( 're ( going ( to ( want ( to ( know ( how ( to react ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VBP 're) (VP (VBG going) (S (VP (TO to) (VP (VB want) (S (VP (TO to) (VP (VB know) (SBAR (WHADVP (WRB how)) (S (VP (TO to) (VP (VB react))))))))))))) (. .)))