where the most notable observation is how long you 've been sitting still 
(ROOT (SBAR (WHADVP (WRB where)) (S (NP (DT the) (ADJP (RBS most) (JJ notable)) (NN observation)) (VP (VBZ is) (SBAR (WHADVP (WRB how) (RB long)) (S (NP (PRP you)) (VP (VBP 've) (VP (VBN been) (VP (VBG sitting) (ADVP (RB still)))))))))))
(ROOT (SBAR (WHADVP (WRB )) (S (NP (DT ) (ADJP (RBS ) (JJ )) (NN )) (VP (VBZ ) (SBAR (WHADVP (WRB ) (RB )) (S (NP (PRP )) (VP (VBP ) (VP (VBN ) (VP (VBG ) (ADVP (RB )))))))))))