Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.

Example Input: If you need a grammar reference, this may well serve until you find a better one. It might be of greater utility if the tone wasn't vaguely condescending and pedantic, and it eschews the panoply of actual examples in favor of definitions. To wit: the 2nd person singular present perfect conjugation of "to love" results in "If you have been loved..." gives me one (singular) example but not the rationale of when to use this. The density of the text preceding the example conjugations will require your own self-study to master (if you must) the ability to spin off a subjunctive 3rd person plural present tense conjugation.The best recommendation I can offer for this is as a companion for language learners who need a quick reference for English analogs of other-language conjugations, such as when you try to conjugate "falar" and need to know which one to use.--#
Example Output: Negative

Example Input: Doesn't get much better than this. What a blessing I have recieved from Pink's expositional approach to this great King's life.
Example Output: Positive

Example Input: I must admit, this book is pretty lame in its organization and all. But there was still a load of stuff that I wouldn't have known, so there is some useful content here. (Heh...I couldn't have passed my test without it...)
Example Output:
Positive