What makes a discourse coherent? One potential factor has been discussed in the linguistic literature in terms of a Question under Discussion (QUD). This approach claims that discourse proceeds by continually raising explicit or implicit questions, viewed as sets of alternatives, or competing descriptions of the world. If the interlocutor accepts…

Traditional syntactic accounts of verb phrase ellipsis (e.g., ''Jason laughed. Sam did [ ] too.'') categorize as ungrammatical many sentences that language users find acceptable (they ''undergenerate''); semantic accounts overgenerate. We propose that a processing theory, together with a syntactic account, does a better job of describing and…