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This paper regards social question-and-answer (Q&A) collections such as Yahoo! Answers as knowledge repositories and investigates techniques to mine knowledge from them to improve sentence-based complex question answering (QA) systems. Specifically, we present a question-type-specific method (QTSM) that extracts question-type-dependent cue expressions from social Q&A pairs in which the question types are the same as the submitted questions. We compare our approach with the question-specific and monolingual translation-based methods presented in previous works. The question-specific method (QSM) extracts question-dependent answer words from social Q&A pairs in which the questions resemble the submitted question. The monolingual translation-based method (MTM) learns word-to-word translation probabilities from all of the social Q&A pairs without considering the question or its type …