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

[EX Q]: This video is fine for ballroom dancers, but it has nothing to do with the authentic Argentine Tango. Even ballroom dancing has now a separate category for Argentine Tango. Unfortunately, this video is not that. That's why, I rate it at 1.
[EX A]: Negative

[EX Q]: What am I reviewing here... this gizmo or the supplier, Eforcity? I never received this product after my order! After waiting and waiting I contacted Eforcity several times -- no reply. After a nasty letter from me Eforcity'r reply feigned lacking information about my mailing address!What a cop-out.I told them I would not pay for it, so Eforcity said they'd give me a refund, which has not come to me yet. I bought another product to replace this from Amazon which arrived quickly from Amazon.
[EX A]: Negative

[EX Q]: Bazyn's next project should be a ransom note. This was a collection of quotes taken from other writers, pieced together, and presented as a book. I don't think there was a single paragraph that did not have a quote. It is one thing to use quotes to support your work, or to provide examples. It is entirely different, and unacceptable, for an author to use quotes to make all of the author's points.Good premise. Poor product. Disappointing.
[EX A]:
Negative