L15 Sub-cat frames or vibhakti charts

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  L15 Sub-cat frames or vibhakti charts


    Verb: Subcategorization Frame or Vibhakti Chart

o  There are other kinds of verbs besides intransitive, transitive, and
   bitransitive, which take mandatory arguments with fixed prepositions.
    + Ex. Verb go:  Ram went to school
       - 'go' takes: subj, PP-with-TO-preposition
       * Above called subcategorization frame for 'go'.
          - Subcat frame of 'go':  subj, PP-with-TO-preposition

    + Ex. Verb ask:  Ram asked Mohan to go.
       - ASK subcat frame: subj, obj, infinitive-verb

o  Vibhakti: Positions such as subj, obj, obj2 are vibhaktis.
    - Prepositions are vibhaktis (like post-positions in Hindi)
    - Thus, subcat frame gives info about the vibhaktis a verb takes.
    - Subcat frames are vibhakti charts

o  Subcat frames or vibhakti charts useful in finding out whether a 
   sentence grammatical

o  Subcategorization frames for verbs can be prepared:
    - Manually, or through
    - Machine learning from corpus
    * Number of verbs in a language relatively limited: few thousands
       (Contrast with nouns in a language: tens of thousands)

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