  In the PDTB-3, several thousand implicit discourse relations were newly
annotated \textit{within} individual sentences, adding to the over 15,000
implicit relations annotated \textit{across} adjacent sentences in the PDTB-2.
Given that the position of the arguments to these \textit{intra-sentential
implicits} is no longer as well-defined as with \textit{inter-sentential
implicits}, a discourse parser must identify both their location and their
sense. That is the focus of the current work. The paper provides a
comprehensive analysis of our results, showcasing model performance under
different scenarios, pointing out limitations and noting future directions.
