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

Example Input: My husband and I didn't have time to attend an 8 hour birthing class at the hospital, so we opted for this video. It was very informative and helped us understand what was happening when we went to the hospital. It was a little cheesy, but definitely worth getting.
Example Output: Positive

Example Input: Great book for people that need to write email. It would be nice to review the grammar rule's from time to time.
Example Output: Positive

Example Input: I ordered this bed in an emergency situation for my 95 year old mother to sleep on. The bed was easy to fill and evacuate, but it has a slow leak that necessitates adding air to it every day. I couldn't send it back because I would have had nothing for my mother to sleep on.
Example Output:
Negative