Bork shuddered.
( Bork ( shuddered . ) )
(ROOT (S (NP (NNP Bork)) (VP (VBD shuddered)) (. .)))
Bork shuddered because he was starting to feel cold.
( Bork ( ( shuddered ( because ( he ( was ( starting ( to ( feel cold ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Bork)) (VP (VBD shuddered) (SBAR (IN because) (S (NP (PRP he)) (VP (VBD was) (VP (VBG starting) (S (VP (TO to) (VP (VB feel) (ADJP (JJ cold)))))))))) (. .)))