Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.
One example: I've read this book with much expectation, it was very boring all through out the book
Solution is here: Negative
Explanation: Review writer does not like the book because it was boring, therefore it is a negative review.

Now, solve this: Dale carnegie wrote very well in his earlier works, this later work (assumedly from later in his life, or judging from the text possibly written postumously) is the worst thing i have ever seen in print.As an english professor it seemed sardonic to me to see someone write so poorly about the topic of speaking well. Perhaps i should have read this garabage aloud instead.
Solution:
Negative