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This paper presents an account of English non-restrictive ('appositive') relative clauses (NRCs) in the framework of 'construction based' HPSG. Specifically, it shows how the account of restrictive relative clause constructions presented in Sag (1997) can be extended to provide an account of the syntax and semantics of NRCs and of the main differences between NRCs and restrictive relatives. The analysis reconciles the semantic intuition that NRCs behave like independent clauses with their subordinate syntax. A significant point is that, in contrast with many other approaches, it employs only existing, independently motivated theoretical apparatus, and requires absolutely no new structures, features, or types.
Glue semantics for HPSG
(2002)
The glue approach to semantic interpretation has been developed principally for Lexical Functional Grammar. Recent work has shown how glue can be used with a variety of syntactic theories and this paper outlines how it can be applied to HPSG. As well as providing an alternative form of semantics for HPSG, we believe that the benefits of HPSG glue include the following: (1) simplification of the Semantics Principle; (2) a simple and elegant treatment of modifier scope, including empirical phenomena like quantifier scope ambiguity, the interaction of scope with raising, and recursive modification; (3) an analysis of control that handles agreement between controlled subjects and their coarguments while allowing for a property denotation for the controlled clause; (4) re-use of highly efficient techniques for semantic derivation already implemented for LFG, and which target problems of ambiguity management also addressed by Minimal Recursion Semantics.
This paper proposes an HPSG account of the French tense and aspect system, focussing on the analysis of the passé simple (simple past) and imparfait (imperfective) tenses and their interaction with aspectually sensitive adjuncts. Starting from de Swart's (1998) analysis of the semantics of tense and aspect, I show that while the proposed semantic representations are appropriate, the analysis of implicit aspectual operators as coercion operators is inadequate.
The proposed HPSG analysis relies on Minimal Recursion Semantics to relate standard syntactic structures with de Swart-style semantic representations. The analysis has two crucial features: first, it assumes that the semantic contribution of tense originates in the verb's semantic representation, despite the fact that tense can get wide scope over other semantic elements. Second, it allows the occurrence of implicit aspectual operators to be controlled by the verb's inflectional class, which accounts for their peculiar distribution.
This work focuses on the syntax and semantics of the expression vice versa, and shows that its syntactic distribution is much more flexible than semantically related expressions. Although vice versa usually appears in clausal coordinate environments, it can in principle occur in any other type of construction. Second, it can occur as an embedded verb phrase or even as a noun phrase, rather than as an adjunct. This suggests that vice versa is a propositional anaphor that corresponds to a converse of a propositional antecedent. Finally, although the predicates singled out to be interchanged are usually nominal, they can in fact be of virtually any part of speech. I argue that a possible account of the interpretation of vice versa lies at the interface between logical form (with rich decompositional lexical semantics along the lines of Pustejovsky (1995)), and pragmatics (drawing from independent work by Hobbs (1990) and Kehler (2002)).
Backshift is a phenomenon affecting verb tense that is visible as a mismatch between some specific embedded contexts and other environments. For instance, the indirect speech equivalent of a sentence like 'Kim likes reading', with a present tense verb, may show the same verb in a past tense form, as in 'Sandy said Kim liked reading'. We present a general analysis of backshift, pooling data from English and Romance languages. Our analysis acknowledges that tense morphology is ambiguous between different temporal meanings, explicitly models the role of the speech time and the event times involved and takes the aspectual constraints of tenses into consideration.
This paper provides a background on the role of world knowledge in disambiguating modals and proposes treating the disambiguation of counterfactuals as a slightly more tractable sub-case of the general problem. Using a model theoretic possible worlds approach, counterfactuals are disambiguated with respect to a world of evaluation resembling classic Formal Semantic treatments (e.g., Kratzer 1977, 1981, 1989; Lewis 1973; Veltman 2005). The world, which provides a context of evaluation, is located through the interaction of the antecedent and consequent propositions with world knowledge axioms. This approach to modal disambiguation provides a connection between a grammar and the type of inferences typically handled in Knowledge Representation Systems (e.g., Hobbs et al. 1990) in a limited domain. The model theoretic semantics are linked with typed feature structures in an HPSG syntax (Pollard and Sag 1994). This grammar is implemented in TRALE, Penn's (2004) Prolog-based framework for typed feature structure grammar development. The compositional semantics in TRALE is specified in Penn and Richters' (2004, 2005) Constraint Language for Lexical Resource Semantics (CLLRS). This semantic component provides a semantic parse in which heads and arguments are combined systematically and the scope of negation or quantification can be accurately reflected. In the case of counterfactuals, the CLLRS semantic parse is passed to a model-theoretic interpreter. The mapping between the CLLRS semantic parse and the well-formed formulas of the model is defined by checking the parseability of the formula in the compositional semantics. Sets of possible worlds interact with constraints on world knowledge and constraints defining counterfactual validity. The truth value for a counterfactual is returned to the grammar relative to a context of evaluation. The results of counterfactual evaluation are returned in a form consistent with the grammar's internal compositional semantics. By the method described above, the interpreter provides a grammar-external component in which inferences involving world knowledge have the potential to be more efficiently evaluated. Through the development of model-checking techniques, for instance, it could be shown whether or not well-formed formulas and constraints hold in larger models and move towards capturing more fine-grained modal inferences in a larger domain.
Recent analyses of mismatches at the syntax-semantics interface investigate e.g. modification of agentive nouns (Larson, 1998), modification of quantifying pronouns (Abney, 1987), or recursive modification (Kasper, to appear). Each of these analyses is tailored to a specific set of data, and it is not immediately obvious how they could be generalised to cover a larger set of data. I propose a unified analysis for these mismatches that attempts to bring out their common ground. This analysis shares some of its basic intuitions with the one of Kasper, but is more general because the mismatches are handled locally in the CONT feature. Its pivot is an elaborate syntax-semantics interface that is based on a surface-oriented syntactic analysis. This analysis generalises easily to the mismatches at the morphology-semantics interface for German separable-prefix verbs that were discussed in (Müller, 2003).
Focus particles, secondary meanings, and Lexical Resource Semantics: The case of Japanese "shika"
(2011)
Japanese has two exclusive particles 'shika' and 'dake'. Although traditionally, both particles were considered to be exclusive particles like 'only', a recent proposal claims that 'shika' is an exceptive particle like 'everyone except' to account for the necessary co-occurrence of the negative suffix 'na' and 'shika'. We show that this negative suffix lacks two critical semantic properties of ordinary logical negation: It is not downward entailing, nor does it license negative polarity items. We show that both 'shika' and 'dake' are exclusive particles, but that 'shika' encodes an additional secondary meaning. The negative suffix only contributes to the sentence's secondary meaning when it co-occurs with 'shika'. We present an HPSG and LRS analysis that models the co-occurrence of 'shika' and the negative suffix 'na', and their contribution to the sentence's secondary meaning.