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A generic framework for Arabic to English machine ... - Acsu Buffalo

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3.4. LEXICAL REPRESENTATIONS FOR VERBS<br />

An important feature of the layered structure of the clause is the differential treatment<br />

given <strong>to</strong> opera<strong>to</strong>rs like tense, aspect and illocutionary <strong>for</strong>ce, and the same contrast is a<br />

vital part of the layered structure of the noun phrase. NP opera<strong>to</strong>rs include determin-<br />

ers (articles, demonstratives, deictics), quantifiers, negation and adjectival and nominal<br />

modifiers (Van Valin and LaPolla 1997).<br />

3.3.1 NP headed<br />

Pronouns can be classified in<strong>to</strong> a number of subtypes: personal pronouns, including pos-<br />

sessive pronouns (PRO), e.g. I liked her book; relative pronouns (PRO REL), e.g. the<br />

book which I bought; demonstrative pronouns (PRO DEM), e.g. That pleased Mary; WH-<br />

pronouns (PRO wh ), e.g. who did Fred see?; and expletive pronouns (PRO EXP ), e.g. it<br />

rained.<br />

3.4 Lexical representations <strong>for</strong> verbs<br />

These distinctions among the four basic Aktionsart types may be represented <strong>for</strong>mally<br />

as in Table 3.2. The term Aktionsart refers <strong>to</strong> the means of a capturing the distinctions<br />

between basic states of affairs, or events, of individual verbs. These representations<br />

are called logical structures. Following the conventions of <strong>for</strong>mal semantics, constants<br />

(which are normally predicates) are presented in boldface followed by a prime, whereas<br />

variable elements are presented in normal typeface. The elements in boldface and prime<br />

are part of the vocabulary of the semantic metalanguage used in the decomposition; they<br />

are not words from any particular human language.<br />

Table 3.2: Lexical representations <strong>for</strong> the basic Aktionsart classes<br />

Verb class Logical structure<br />

State predicate’ (x) or (x, y)<br />

Activity do’ (x, [predicate’(x) or (x, y)])<br />

Achievement INGR predicate’ (x) or (x, y)<br />

Accomplishment BECOME predicate’ (x) or (x, y)<br />

38

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