You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.

I've read this book with much expectation, it was very boring all through out the book
Solution: Negative
Why? Review writer does not like the book because it was boring, therefore it is a negative review.

New input: If you want space to carry your music everywhere...this is your device. For all those reviews about the cover, now the cover included with the player has window to the screen, no need to take the player out of the case, unless you are changing the battery. A USB cable is included...no extra purchase. And the fact that you can copy the music back to your computer is a plus for me. The buttons takes a little getting use to it, but for almost $200 less, I can deal with it. The software is easy to learn, and the fact that you can replace the battery with ease...big plus...
Solution:
Positive