you 're not merely watching history , you 're engulfed by it . 
(ROOT (S (S (NP (PRP you)) (VP (VBP 're) (RB not) (ADVP (RB merely)) (VP (VBG watching) (NP (NN history))))) (, ,) (S (NP (PRP you)) (VP (VBP 're) (VP (VBN engulfed) (PP (IN by) (NP (PRP it)))))) (. .)))
(ROOT (S (S (NP (PRP )) (VP (VBP ) (RB ) (ADVP (RB )) (VP (VBG ) (NP (NN ))))) (, ) (S (NP (PRP )) (VP (VBP ) (VP (VBN ) (PP (IN ) (NP (PRP )))))) (. )))