Clearly, yes.
( Clearly ( , ( yes . ) ) )
(ROOT (FRAG (ADVP (RB Clearly)) (, ,) (NP (RB yes)) (. .)))
You should already know the answer is yes. 
( You ( ( ( should already ) ( know ( ( the answer ) ( is yes ) ) ) ) . ) )
(ROOT (S (NP (PRP You)) (VP (MD should) (ADVP (RB already)) (VP (VB know) (SBAR (S (NP (DT the) (NN answer)) (VP (VBZ is) (NP (UH yes))))))) (. .)))