PL 24 (Unioninkatu 40)
00014 HELSINGIN YLIOPISTO
Puhelin +358 (09) 1911 (vaihde)
Faksi +358 (09) 191 28313
Lexicalist Grammars and Morphology
Make a new subdirectory
lkb-cfg-6 for this exercise.
Copy all the files from
Start LKB and load the grammar with the
file from your
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.
View the lexical entries in
of type word, entries now have types such as
det-lxm or noun-lxm, which are subtypes of
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.
View the letter-sets and inflectional rules in
!v includes the English vowel letters.
!t includes the English consonants.
!s includes every letter except s.
The plural noun inflectional rule
%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
(last letter "s" but second-last letter in
!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?
© 2006-2010 Graham Wilcock
View the type hierarchy in
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
head-second for rules where the head daughter is the
These types implement the Head Feature Principle. How?
If a unary-rule is also head-initial, its type is
If a binary-rule is head-initial, its type is
If a ternary-rule is head-initial, its type is
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?