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  L15 Sub-categorization of verbs


         Verb: Subcategorization

o  Verbs can be intransitive, transitive, or bitransitive.
    * These are called subcategories of verb category:
       + Ex. 'Intransitive verb' is a subcategory of verb category.

o  Different verbs take different number of arguments
   (arguments are theta roles or karaka roles)
    - Some arguments are necessarily required, called mandatory 
      arguments, without which sentence is incomplete.
       + Ex.: Ram wept.
           One argument is mandatory for wept.
    - The mandatory arguments occur at fixed positions
      with fixed prepositions (that is, with fixed vibhaktis)

o  Intransitive verb: Active voice of verb takes only one mandatory
   argument (as its subject)
    + Ex.: Verbs: sleep, bathe
        + He slept. 
      'sleep' takes: Mandatory argument in subject position.
    * Subject position: Position immediately before the verb.

o  Transitive verb: Active voice of verb takes two mandatory arguments
   (as its subj. and obj)
    + Ex.: Verbs: eat, kick
        + He ate an apple. 
      'ate' takes: Mandatory arguments in subject and object position.
    * Object position: Position immediately after the verb (and without
      preposition in the NP).

o  Bi-transitive verb: Active voice of verb takes three mandatory
   arguments (as its subj. and object and object2)
    + Ex.: Verb: give
        + Ram gave Mohan an apple.
      'give' takes: Mandatory arguments in subject position and object 
      and object2 position.
    * Object2 position: Position immediately after the object position
      and without preposition.

o  Positions such as subj, obj, obj2 are vibhaktis.
    - Subcategorization is vibhakti level sub-classification
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