You know.
( You ( know . ) )
(ROOT (S (NP (PRP You)) (VP (VBP know)) (. .)))
You know, because you were told.
( You ( ( ( know , ) ( because ( you ( were told ) ) ) ) . ) )
(ROOT (S (NP (PRP You)) (VP (VP (VBP know)) (, ,) (SBAR (IN because) (S (NP (PRP you)) (VP (VBD were) (VP (VBN told)))))) (. .)))