I mustn't keep you.
( I ( ( ( must n't ) ( keep you ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (MD must) (RB n't) (VP (VB keep) (NP (PRP you)))) (. .)))
It would be too risky to keep you.
( It ( ( would ( be ( too ( risky ( to ( keep you ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (MD would) (VP (VB be) (ADJP (RB too) (JJ risky) (S (VP (TO to) (VP (VB keep) (NP (PRP you)))))))) (. .)))