Head-driven Phrase Structure Grammar I

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Basic Idea Typed feature structure HPSG: First glance Motivation CFG treats each grammatical category symbol as atomic without internal structure. ⇒ Two categories are either identical or different. ⇒ There is no mechanism for saying that two categories are alike in some ways, but different in others. Words and phrases in NLs typically behave alike in certain respects, but not others. Cross-cutting grammatical properties 3rd singular subject plural subject direct object NP denies deny No direct object NP disappears disappear Weiwei Sun Head-driven Phrase Structure Grammar I 3/61
Basic Idea Typed feature structure HPSG: First glance Features and values ◮ Linguistic feature: a property-like element that indicates the grammatical behavior of syntactic constituents. ◮ The elements associated to linguistic expressions, such as words, can be broken down. ◮ Features are usually modeled as pairs of feature names and feature values. Feature Example Value person I go, you go, he goes 1st, 2nd, 3rd number he dances, they dance singular, plural case he brings Bob, Bob brings him nominative accusative tense go, went, gone past, present, future modality may, can, conditional, subjunctive A nice summary of linguistic features http://www.grammaticalfeatures.net Weiwei Sun Head-driven Phrase Structure Grammar I 4/61
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Head-driven Phrase Structure Grammar I

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