1. Yelp: recommend, sure, like, good, care, great, special, impressed, fresh, help, ready, enjoy, friendly, honor, helpful, clean, happy, accept, greeted, amazing
2. IMDB: like, care, funny, help, sure, recommend, good, save, fit, great, special, interesting, enjoy, well, play, better, giving, original, convincing, true
3. PeerRead: clear, sure, convincing, convinced, ready, well, true, clearly, surprising, novel, convincingly, recommend, guarantee, improve, interesting, support, satisfactory, help, acceptable, convince

University of Michigan - Ann Arbor

1. Negative reviews tend to still include positive opinions due to a na¨ıve interpretation of the positivity bias, where positive words express positive sentiments without accounting for negation or other contextual meaning of these words.
2. Negative reviews tend to use indirect expressions (i.e., applying negations to positive words) to indicate negative opinions (e.g., “not clean”).

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