The problem of Complementary Entity Recognition (CER) is first proposed by Xu et. al.<cite> (Xu et al., 2016)</cite> . However, our previous work focuses on product reviews and consider CER as a special kind of aspect extraction problem (Liu, 2015) . Determining the polarities of compatibility is reduced to a traditional sentiment classification problem. This paper focuses on yes/no QAs in PCQA and the polarities of compatibility is a yes/no answer classification problem.