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: From pictures, etc., we thought this trike somehow had a means of locomotion - swaying back and forth? My determined child never figured it out, and instructions never hinted to a technique. So, it ends up being a scooter that is not very functional because it's hard to balance on one side and scoot with the other foot.
Solution:
Negative