Ivan A. Sag: HPSG Research Activity
I've worked on a number of grammatical problems using the framework
of Head-Driven Phrase Structure Grammar. Here are some of my current projects:
The English Auxiliary System: I've been working on this topic
for (I'm embarrassed to say) 25 years now. My latest paper,
`Rules and Exceptions in the English Auxiliary System' will appear in revised
form in the Journal of Linguistics.
- Sag, Ivan A. 2001. (currently unavailable)
Rules and Exceptions in the English Auxiliary System'. Version
of July, 2001.
Bob Levine and I have recently completed a couple of papers arguing
that HPSG treatments of filler-gap dependencies and parasitic gaps
account for various important facts that seem to be inconsistent with
(current or previous) transformational approaches. These are:
- Levine, Robert D., and Ivan A. Sag. 2003. Some Empirical
Issues in the Grammar of Extraction. Proceedings of the HPSG03
Conference. Michigan State University, East Lansing, Stefan Mueller
(Editor). CSLI Publications, available at (.pdf file)
- Levine, Robert D., and Ivan A. Sag.
Gengo Kenkyu. (.ps file) (.pdf file)
Minimal Recursion Semantics (MRS):
The framework of MRS, a `flat' semantic representation scheme that simulates
embedding via `handle' identity and
which allows scope ambiguities to be underspecified, grew out of work
at the CSLI
Lab. A new version of our introductory paper on this will
be available soon. For the moment, one can consult:
- Copestake, Ann, Dan Flickinger,
Ivan A. Sag, and Carl Pollard.
Minimal Recursion Semantics: an Introduction
Draft of September, 1999.
Warlpiri Word Order:
When we can find time, Cathryn
Donohue and I work on word order in Australian languages
using Linearization Theory -- a formal framework for dealing with word order
variations and discontinuous constituency developed by Mike Reape, Andreas
Kathol and others. Our first stab at Warlpiri word order can be found in
the following draft (comments welcome):