... specific and tangible features. Also, there are somewhat a fixed set of features of a specific type of product, for exam-ple, ease of use, durability, battery life, photo quality, and shutter lag ... examples of sen-tences that our system identified as reasons of complaints. (1) Unfortunately, I find that I am no longer comfortable in your establishment because of the unprofessional, ... classification is a task of determining positive or negative sentiment of words (Hatzivassiloglou and McKeown, 1997; Turney, 2002; Esuli and Sebastiani, 2005). Sen-timent of phrases and sentences...