Yliopiston etusivulle In English
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clt361: Grammar Engineering - lukuvuosi 2009-2010

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Lexicalist Grammars and Morphology

  • Make a new subdirectory lkb-cfg-6 for this exercise. Copy all the files from ~gwilcock/delphin/lkb/src/data/itfs/g6morph into it.
  • Start LKB and load the grammar with the script file from your lkb-cfg-6 directory. Parse these dogs chased the cats.

The Type Hierarchy

  • View the type hierarchy in types.tdl and compare it with the type hierarchy in Syntactic Theory Chapter 8. There are several differences in the names, but the way the lexeme subtypes are organized as a hierarchy is basically similar.

Lexical Entries

  • View the lexical entries in lexicon.tdl. Instead of type word, entries now have types such as det-lxm or noun-lxm, which are subtypes of lexeme.
  • Add lexical entries for these noun lexemes: bus, boss, fox and ox.
  • Parse these dogs chased the bus, these dogs chased the boss, these dogs chased the fox, and these dogs chased the ox.

Inflectional Rules

  • View the letter-sets and inflectional rules in inflr.tdl.
    The letter-set !v includes the English vowel letters.
    The letter-set !t includes the English consonants.
    The letter-set !s includes every letter except s.
  • The plural noun inflectional rule pl-noun_irule includes %suffix (!s !ss). This means: if the last letter is in the set !s (any letter except "s"), it is replaced by !ss. So the plural of dog is dogs ("g" -> "gs").
  • (!ss !ssses) means: suffix !ss (last letter "s" but second-last letter in !s) is replaced by !ssses. So the plural of bus is busses ("us" -> "usses").
  • (ss sses) means: suffix ss (last two letters both "s") is replaced by sses. So the plural of boss is bosses ("ss" -> "sses")
  • Parse these dogs chased the busses and these dogs chased the bosses.
  • Edit the plural noun inflectional rule to make the correct plural foxes from fox. Parse these dogs chased the foxes.
  • The plural of ox is irregular: oxen, and in British English, the plural of bus is buses. What about these dogs chased the buses and these dogs chased the oxen?

Grammar Rules

  • View the type hierarchy in types.tdl again. There are three subtypes for rules: unary-rule for rules with one daughter, binary-rule for rules with two daughters, and ternary-rule for rules with three daughters. These types concatenate the daughters' ORTH strings to make the mother's ORTH string. How?
  • There are two other rule subtypes: head-initial for rules where the head daughter is the first daughter, head-second for rules where the head daughter is the second daughter. These types implement the Head Feature Principle. How?
  • If a unary-rule is also head-initial, its type is unary-head-initial.
    If a binary-rule is head-initial, its type is binary-head-initial.
    If a ternary-rule is head-initial, its type is ternary-head-initial.
    If a binary-rule is head-second, its type is simply head-second. Why?
  • View the grammar rules in rules.tdl. Some of the "work" of the rules has been shifted into the type definitions. The rules are simpler, and they now look more like the Syntactic Theory textbook rules than before.
  • Why don't the rules specify the value of COMPS in the mother?
© 2006-2010 Graham Wilcock

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