It is a widely held view among linguists and psycholinguists that the phonology of a child's speech at any stage during the acquisition process is structured (cf. Jakobson 1941). Such structure, however, has not been well documented in the past. This paper is an attempt to find and present the phonological structure of three children at age two. One possible approach, used in ?1 below, is an analysis of substitutions, or sets of correspondences between the child's renditions and the utterances of the adult model. Such an approach reveals much information about phonetic structure, distribution, and particular problems which the child is encountering and overcoming at the moment. Another approach, used in ?2 below, is a phonological analysis, potentially more revealing of structure, but encompassing many more theoretical problems. To be most useful, the resultant phonology should fit into a series of phonologies, each of which describes an independent stage with segmental and rule structure, and the totality of which presents a unified picture of the development of segmental and rule structure from the post-babbling stage to the full mastery of English phonology.' But such a developmental sequence may not be uni-dimensional in detail, since the child may attempt to work with incorrect hypotheses which are later rejected, or may regress at times. The first of these two approaches is parallel to the linguistic study of borrowving. The types of changes a child makes in 'borrowing' words from the language of the environment are as revealing of the borrower's phonological structure as are the changes which language X imposes on the borrowed words of language Y. Likewise, a series of phonologies covering a period of several years in the life of a particular child can be treated as a special case of the study of internal diachronic phonology. The writing of a phonology for a child's speech is especially problematic because there are no existent theories which can be directly applied. It is not at all obvious that we would want to attribute to the very young child the complicated rule structure which generative phonology (cf. Chomsky & Halle 1968) employs to describe mature speech. There is reason to believe that, from the beginnings of speech, the child incorporates phonological rules into his system, although his rules may bear no resemblance whatever to those of the
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