yeah okay you go ahead
( yeah ( okay ( you ( go ahead ) ) ) )
(ROOT (S (VP (VB yeah) (ADJP (JJ okay) (SBAR (S (NP (PRP you)) (VP (VBP go) (ADVP (RB ahead)))))))))
No, do not go ahead.
( No ( , ( ( ( do not ) ( go ahead ) ) . ) ) )
(ROOT (S (INTJ (UH No)) (, ,) (VP (VB do) (RB not) (VP (VB go) (ADVP (RB ahead)))) (. .)))