We consider three kinds of polarity-reversing context: negation, comparative adverb, and discourse connective.
we determine whether w A is negated using the Stanford dependency parser, which explic-itly annotates instances of negation; we determine the existence of a comparative adverb (e.g., "more", "less") using the POS tag "RBR"; and we determine whether A exists in a clause headed by a polarityreversing connective, such as although.