A common linguistic definition of paraphrase is that two sentences are paraphrases of each other if they mutually entail each other.

• Microsoft Research Paraphrase Corpus: Dataset, paper: Dolan & Brockett 2003 - Automatically Constructing a Corpus of Sentential Paraphrases

Task: convert a question (and possibly the answer) into a statement. Not quite paraphrase exactly, but related.

• https://github.com/SunnyWay/question_to_statement

Related pages: Question Generation

• Entailment