Some bugs are hell to track down.
( ( Some bugs ) ( ( are ( hell ( to ( track down ) ) ) ) . ) )
(ROOT (S (NP (DT Some) (NNS bugs)) (VP (VBP are) (ADJP (JJ hell) (S (VP (TO to) (VP (VB track) (PRT (RP down))))))) (. .)))
It is difficult to catch some bugs.
( It ( ( is ( difficult ( to ( catch ( some bugs ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBZ is) (ADJP (JJ difficult) (S (VP (TO to) (VP (VB catch) (NP (DT some) (NNS bugs))))))) (. .)))