after you laugh once ( maybe twice ) 
(ROOT (SBAR (IN after) (S (NP (PRP you)) (VP (VBP laugh) (ADVP (RB once)) (-LRB- -LRB-) (ADVP (RB maybe) (RB twice)) (-RRB- -RRB-)))))
(ROOT (SBAR (IN ) (S (NP (PRP )) (VP (VBP ) (ADVP (RB )) (-LRB- ) (ADVP (RB ) (RB )) (-RRB- )))))