In this work, we construct SQuAD 2.0,1 a new dataset that combines answerable questions from the previous version of SQuAD (SQuAD 1.1)with 53,775 new, unanswerable questions about the same paragraphs. Crowdworkers crafted these questions so that (1) they are relevant to the paragraph, and (2) the paragraph contains a plausible answer—something of the same type as what the question asks for. Two such examples are shown in Figure 1.