Morphology - A Brief Introduction

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.

Morphotactics and Agglutination

While the morphology of English is relatively simple, some other languages allow multiple levels of inflection. Morphotactics is the study of these levels. Some examples of agglutinative languages (those that have a complex morphotactics) are Turkish and Finnish.

Two-Level Rules

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.


References

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.


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