is as conventional as can be 
(ROOT (S (VP (VBZ is) (ADJP (ADJP (RB as) (JJ conventional)) (SBAR (IN as) (S (VP (MD can) (VP (VB be)))))))))
(ROOT (S (VP (VBZ ) (ADJP (ADJP (RB ) (JJ )) (SBAR (IN ) (S (VP (MD ) (VP (VB )))))))))