that it 's not clear whether we 're supposed to shriek 
(ROOT (SBAR (IN that) (S (NP (NP (PRP it))) (VP (VBZ 's) (RB not) (ADJP (JJ clear)) (SBAR (IN whether) (S (NP (PRP we)) (VP (VBP 're) (VP (VBN supposed) (S (VP (TO to) (VP (VB shriek))))))))))))
(ROOT (SBAR (IN ) (S (NP (NP (PRP ))) (VP (VBZ ) (RB ) (ADJP (JJ )) (SBAR (IN ) (S (NP (PRP )) (VP (VBP ) (VP (VBN ) (S (VP (TO ) (VP (VB ))))))))))))