ensure that the film is never dull 
(ROOT (S (VP (VB ensure) (SBAR (IN that) (S (NP (DT the) (NN film)) (VP (VBZ is) (ADVP (RB never)) (ADJP (JJ dull))))))))
(ROOT (S (VP (VB ) (SBAR (IN ) (S (NP (DT ) (NN )) (VP (VBZ ) (ADVP (RB )) (ADJP (JJ ))))))))