Morphology is the study of word structure. People who study
morphology generally recognize two distinct fields:
inflectional and derivational morphology.
Inflectional morphology
is the study of the way words change when used in different
grammatical contexts, for instance I run versus he
runs. Derivational morpholgy, as in revolve versus
revolution is concerned with
the principles behind the creation of completely new words,
and is less concerned with the grammatical role they play.
Derivational rules tend to be much less productive, or
regular, than inflectional rules, and they also are much more likely
to involve changes in the category, or
part-of-speech, of a word than are inflectional rules.
While the morphology of English is relatively simple, some
other languages allow multiple levels of inflection.
Morphotactics One popular way of specifying morphological properties of a
language is with two-level rules,
so named
because they directly relate the visible surface form of
a word to an abstract, lexical form, thereby uncovering
a great deal of language regularity that might not be obvious to
the casual observer. Two-level rules are usually implemented using
finite-state analysis, in which
the lexical and surface forms are compared, one character at a
time, using a table that specifies which character pairs
are allowed to appear in each state, and which are not.
Koskenniemi, Kimmo. Two-level morphology: a
general computational model for word-form recognition and
production. Publication No. 11. Helsinki: University of
Helsinki Department of General Linguistics, 1983.
Sproat, Richard. Morphology and Computation.
The MIT Press, 1992.
Morphotactics and Agglutination
Two-Level Rules
References
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