is not , nor will he be , back 
(ROOT (S (VP (VBZ is) (RB not)) (, ,) (CC nor) (SINV (MD will) (NP (PRP he)) (VP (VB be))) (, ,) (ADVP (RB back))))
(ROOT (S (VP (VBZ ) (RB )) (, ) (CC ) (SINV (MD ) (NP (PRP )) (VP (VB ))) (, ) (ADVP (RB ))))