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

[Q]: Great book for people that need to write email. It would be nice to review the grammar rule's from time to time.
[A]: Positive


[Q]: Product received timely. The plug in feature is favorable in that there is no concern of battery failure. Product is easy to use.
[A]: Positive


[Q]: This pair of boots are too tight and between sizes is big jump,i don't know if there is any other way I can stretch them a bit,they are also only made for soft soil , asphalt concrete will finish them too fast
[A]:
Negative