The main reason is that the understanding of the basic entailment processes will allow us to model more accurate semantic theories of natural languages (Chierchia and McConnell-Ginet, 2001) and design important applications (Dagan and Glickman, 2004), e.g., Question Answering and Information Extraction.
they were correctly classified by our overall model (last column) and miss-classified by the models in the seventh and in the eighth columns.