text1: I don't know.
feat_premise_binary_parse: ( I ( ( ( do n't ) know ) . ) )
feat_premise_parse: (ROOT (S (NP (PRP I)) (VP (VBP do) (RB n't) (VP (VB know))) (. .)))
text2: I am certain.
feat_hypothesis_binary_parse: ( I ( ( am certain ) . ) )
feat_hypothesis_parse: (ROOT (S (NP (PRP I)) (VP (VBP am) (ADJP (JJ certain))) (. .)))