for teens to laugh , groan and hiss 
(ROOT (SBAR (IN for) (S (NP (NNS teens)) (VP (TO to) (VP (VB laugh) (, ,) (VB groan) (CC and) (JJ hiss))))))
(ROOT (SBAR (IN ) (S (NP (NNS )) (VP (TO ) (VP (VB ) (, ) (VB ) (CC ) (JJ ))))))