Teacher: Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.
Teacher: Now, understand the problem? If you are still confused, see the following example:
I've read this book with much expectation, it was very boring all through out the book
Solution: Negative
Reason: Review writer does not like the book because it was boring, therefore it is a negative review.

Now, solve this instance: I am not usually so critical, and I must admit I read several of the books years ago, but I finally put them down without reading the rest because there was just too many descriptions of sex in them. The detailed and varied descriptions were simply unneccesary for a book that is touted as a "must read" for women as young as 10!
Student:
Negative