, is a temporal inquiry that shoulders its philosophical burden lightly . 
(ROOT (S (, ,) (VP (VBZ is) (NP (NP (DT a) (JJ temporal) (NN inquiry)) (SBAR (WHNP (WDT that)) (S (VP (VBZ shoulders) (NP (PRP$ its) (JJ philosophical) (NN burden)) (ADVP (RB lightly))))))) (. .)))
(ROOT (S (, ) (VP (VBZ ) (NP (NP (DT ) (JJ ) (NN )) (SBAR (WHNP (WDT )) (S (VP (VBZ ) (NP (PRP$ ) (JJ ) (NN )) (ADVP (RB ))))))) (. )))