I study the grammar of conversational speech, using databases of spoken English made available through 补苍诲听迟丑别听听(LDC). I explore the use conditions associated with grammatical constructions and intonation patterns鈥攁 research area often referred to as听discourse pragmatics. My research in discourse pragmatics focuses on the prosodic and grammatical expression of the pragmatic roles听topic听补苍诲听蹿辞肠耻蝉, and on what grammatical mechanisms people use to do conversational work like expressing an emotional reaction to something, introducing a new topic into the conversation, announcing forthcoming propositional content and assessing what has been said before. This work is a collaborative effort with听several current and former CU students, including听听(on the nonstandard听) and听听(辞苍听). For findings of an NSF-sponsored project on conversational reference on which Hartwell and I worked, see the听听site. In recent work with CU post-doctoral student Jill Duffield, we are exploring explanations for the prevalence of subject relative-clauses in English conversation. We are investigating the claim that the subject relative-clause (as represented by the bracketed portion of听cars听摆that are designed with human beings in mind])听is as common as it is not because of general-purpose interpretive or production constaints but because it is听part of an entrenched discourse routine, the presentational relative-clause construction (e.g.,听There are a lot of people who babysit in their homes). Recently, Jill and I have begun a series of experiments that we hope will validate a processing-based explanation (ambiguity avoidance) for one of the most enduring 'purely syntactic' constraints--the so-called (which we refer to, following Postal 2004,听as the anti-complementizer effect, or ACE). ACE names the听negative judgment that language users make about a certain kind of听long-distance听dependency鈥攖hose听in which a subject is instantiatiated in the pre-clausal filler position and the complementizer that appears before the 'gapped' argument, as in,听e.g., the wh-question *Who did she believe that left? or the relative clause *the person we believed that was hired. A fact that we think will help us to explain the nature of ACE is this:听the sentence Who did she believe that left? has an unwelcome reading, in which it asks 'Who among the people that left did she believe?'. We also think it is significant that 'violations' like the following are fine: What did she say that was a lie? Why? We believe that our psycholinguistic research program will provide some intuitively satsifying听answers.听
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