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SynCro - Parsing Simple Croatian Sentences

Kristina Vučković, Božo Bekavac, Zdravko DovedanUniversity of Zagreb, Faculty of Humanities and Social Science

{kvuckovi, bbekavac,zdovedan}@ffzg.hr

NooJ2009Tozeur

2009-06-09

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Overview of the work

on our way to complete parse trees for Croatian sentences building partial trees for simple Croatian

sentences favor of precision over recall

Building syntactic parse trees for Croatian is quite a challenge!

properties of Croatian language: mostly free word (better to say

constituent?) order → scrambling very frequent

could be a long distance between parts of predicate

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Syntactic trees

at this stage, the following structures of parse trees are described verb subject - verb subject - verb - direct object subject - verb - direct (and, or indirect

object) in addition to all these combinations, we

can detect adverbial phrases of place and adverbial phrases of time (temporal

expressions) Complex combinations (e.g. multiple PPs)

are not described

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Sentance structure in Croatian

<subject> <predicate> <object_D> <object_ID> <A_place><A_time><predicate>

<predicate>

<subject>

<subject>

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Recognition of: predicate node

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Recognition of: subject node

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Recognition of: direct object node

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Recognition of: indirect object node

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Recognition of: Adverbs of Time

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Recognition of: Adverbs of Place

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Exampless

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Exampless

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Exampless

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Exampless

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Exampless

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Exampless

dislocated predicate <PRED>

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Exampless

dislocated predicate <PRED>

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Exampless

dislocated predicate <PRED>

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Exampless

dislocated predicate <PRED> and dislocated subject <SUB>

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Addition to the Lexicon

For recognizing Adverbials of Time and Place:

Adjectives +time / + place R+vr R+mt

Prepositions +time / + place S+vr S+mt

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Problems

if there is a nominal predicate

if the <NP> node is a coordination made of 2 or more <NP>’s of different gender

if <S> has more than one annotation

ex. The child was very

smart.

-> The child was->was very smart. ex. The boy and a girl were

very smart.

->The boy and a girl =><NP+p+m> ex.

He was singing from March to April.

He was singing from Paris to Tozeur.

and Future Work

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