• If a node's label is 'SBAR', its parent's label is 'NP' and its first child's label is 'WHNP' or 'WHPP' or 'IN', then if we can find a noun in the left siblings of 'SBAR', this subordinate clause could be an attributive clause or appositive clause.
automatic summarization can be broadly divided into two categories: extractive and abstractive summarization.