Will it be possible to extract correct sentiment in sentences using discourse structure? How to improve sentiment classification using discourse approach?
Sentiment, analogous to emotion, depends upon many factors of communication. Because of its pervasive influence, we cannot depend solely upon any single element of language to correctly extract sentiment or emotion. That being said, the information structure of a text often reveals much of the sentiment within it. The content placed in emphatic positions often embodies core aspects of the statement's sentiment.
I would suggest also reviewing the following resources:
Mackenzie, J. Lachlan, and Laura Alba-Juez. 2019. Emotion in Discourse. Pragmatics & Beyond New Series (P&BNS). Amsterdam: John Benjamins Publishing Company. https://search.ebscohost.com/login.aspx?direct=true&db=nlebk&AN=2041432&site=ehost-live&scope=site.
Lüdtke, Ulrike. 2015. Emotion in Language : Theory – Research – Application. Consciousness & Emotion Book Series. Amsterdam: John Benjamins Publishing Company. https://search.ebscohost.com/login.aspx?direct=true&db=nlebk&AN=1109449&site=ehost-live&scope=site.