This thesis discusses rule incompatibility phenomena (i.e., ungrammaticality resulting from two or more applications of movement rules in particular ways) and their related theoretical problems. The discussion concludes that the transformational component is exempted from many tasks which have been assigned to it, and the component should be reduced to a great extent. Rule incompatibility phenomena cannot be accounted for well by devices in the transformational component, such as the SD and SC of transformational rules, rule ordering, or constraints on rule application. The task of explaining the phenomena must be transferred to S-structure or the LF-component. A proposal is made that the phenomena are to be handled by constraints on binding theory, which operates at S-structure. Under the assumption of the free indexing theory, instances of rule incompatibility involve ambiguity in binding, or phrases not eligible to be binders. Thus, they are ruled out by the Unique Ā-Binding Constraint (UĀBC), which states that Ā-bound expressions must be uniquely bound to binders, and the Constraint on Incomplete Ā-Binders, which states that incomplete phrases cannot Ā-bind expressions. These constraints release the transformational component from the task of explaining the grammaticality judgments. Some cases of rule incompatibility can be accounted for either by the wh-island constraint or by the UĀBC. But, Chomsky's bounding theory must be revised, and given a revised bounding theory, the wh-island constraint does not hold. Nonexistence of the wh-island constraint indicates that rule incompatibility phenomena must be accounted for by the other alternative (i.e., the UĀBC), and that the transformational component is exempt from the wh-island constraint. Of the two possible indexing theories, the free indexing theory can handle rule incompatibility phenomena, but the other theory (the simultaneous indexing theory in our terminology) cannot. The choice of the free indexing theory releases transformational rules from the task of assigning indices to traces. It is furthermore suggested that the transformational component may be exempt from even the Subjacency Condition and the rule Move-α, and therefore, may be abandoned completely.

The tree model of segment structure proposed by Clements (1985) is an important innovation in phonological theory, making possible a number of interesting and arguably correct predictions about the form of assimilation rules, locality of rule application, and the organization of the distinctive feature system. Clements's proposal has given rise to an expanding literature, including Sagey (1986), Schein and Steriade (1986), Archangeli and Pulleyblank (forthcoming), and McCarthy (forthcoming). In this paper, I argue that the tree model as it stands faces a serious empirical shortcoming: it fails to provide an adequate account of diphthongization rules, here defined as rules that convert a segment (vowel or consonant) into a heterogeneous sequence. I propose a revised tree model, which for clarity and explicitness uses coindexation rather than association lines to indicate temporal association. I argue that my proposal solves the diphthongization problem, and that it also makes it possible to restrict the power of segment structure theory in the following way: the "feature- bearing units" (Clements 1980) for any feature are always elements of the prosodic tier, and not nodes in the segment tree.

Language games have fascinated linguists in that they can provide unusual insight into the grammars of languages. The evidence provided by the study of a language game has usually been used by linguists to argue for certain phonological and morphological analysis of the source language. Recent studies of the mechanism that derives language games also discuss broader theoretical issues like the nature of this mechanism, its reflection of internal structure of the syllable and morpheme, its relationship with the morphological and phonological processes in natural languages, and the proper phonological and prosodic representations in describing the formation of language games (e.g., McCarthy 1981, 1982; Yip 1982 ). Chinese secret languages are language games spoken by children, thieves, or fortune tellers. They are also called Fanqie languages because their formation follows the traditional Chinese Fanqie principle which divides a syllable into an Initial and a Final. (1) gives some examples illustrating this traditional division of syllables . (1) Initials and Finals in Chinese (Tones are omitted): a. /ma/; Initials: /m/; Finals: /a/ b. /kuai/ [kway]; Initials: /k/; Finals: /uai/ [way] c. /pan/; Initials: /p/; Finals: /an/ d. /tuan/ [twan]; Initials: /t/; Finals: /uan/ [wan] e. /uan/ [wan]; Initials: none; Finals: /uan/ [wan]. Within a syllable the first consonant is the Initial, what remains is the Final. (1) e. is an example of the "zero Initial" syllable. Chao (1931) describes eight varieties of Chinese secret languages in terms of this traditional view on the Chinese syllable. In these languages each syllable is typically split into two syllables with the addition of a fixed Initial and /or a Final. For example, one of the Mandarin secret languages derives [may ka] from the base word /ma/, the fixed Initial /k/, and the fixed Final /ay /. Departing from this traditional view, Yip (1982) proposes to treat the formation of these secret languages as instances of reduplication within the framework of CV phonology (McCarthy 1979, Clements & Keyser 1983). In this paper I examine the behavior of nasal segments in Taiwanese secret languages described by Li (1985) in the hope of revealing the relationship between the phonological structure of the source language and that of the secret languages, and throwing some light on the understanding of the formal mechanism and principles employed by Chinese secret languages. I follow Yip in treating the formation of Chinese secret languages as reduplication,3 and assume an autosegmental model of phonology that incorporates underspecification (e.g. Archangeli & Pulleyblank 1986) and feature geometry (e.g. Clements 1985a; Sagey 1986). In Section 1, an introduction of three types of Taiwanese secret languages is given. Section 2 shows that the spreading of nasality of the nasalized vowels throughout the whole reduplicated domain in the secret language argues for the existence of a floating nasal feature in Taiwanese and the treatment of this domain as a basic morphological word. The behavior of the syllable final consonants in these Taiwanese secret languages presented in Section 3 calls for an assimilatory treatment rather than the dissimilatory one proposed by Yip (1982). Section 4 discusses some theoretical implications with respect to the theory of reduplication in analyzing the syllabic nasals in Taiwanese secret languages. Finally, a conclusion summaries the preceding sections.

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A typology of voicing assimilation has been presented in Cho (1990a), whose result will be summarized in section 2. Like many other marked assimilations, voicing assimilation is characterized as spreading of only one value of the feature [voice]. The main body of this paper will compare a privative theory of voicing with a binary theory. It has often been noted that assimilation rules are natural rules since they are cross - linguistically very common. It has also been observed that they are asymmetric in nature (Schachter 1969, Schane 1972). For example, nasalization, palatalization, and assimilation of coronals to noncoronals are extremely common but the reverse processes are not frequently found in natural languages. On the other hand, voicing assimilation has been known to be relatively free in choosing its propagating value. Whereas the other assimilation rules are sensitive to the marked and the unmarked value of a given feature, assimilating a voiced consonant to a voiceless consonant has been assumed to be as natural as the reverse process (Anderson 1979, Mohanan (forthcoming)). I have argued that voicing assimilation is no different in its asymmetry from the other types of assimilation by demonstrating the need for two parameters and one universal delinking rule. A universal typology emerges from the possible interaction among the values associated with delinking and spreading parameters. The following theoretical assumptions will be utilized throughout this paper. First, I follow the standard assumption in Autosegmental Phonology that assimilation rules involve not a change or a copy but a reassociation of the features. This operation of reassociation called spreading is assumed to be the sole mechanism of assimilation rules (Goldsmith 1979, Steriade 1982, Hayes 1986). Second, I assume Underspecification Theory, which requires that some feature values be unspecified in the underlying representation ( Kiparsky. 1982, Archangeli and Pulleyblank (forthcoming)). Distinguishing different versions of Underspecification Theory will not be relevant in the discussion since I will discuss whether voicing is universally a privative feature or a binary opposition. Third, I assume the principle of Structure Preservation (Kiparsky 1985, Borowsky 1986), which is expressed in terms of constraints that apply in underlying representations and to each stage in the derivation up to the level at. which they are turned off (usually in the lexicon). Structure Preservation will be invoked to classify obstruents on the one hand, and sonorants and the other redundantly voiced segments on the other. Last, I translate the Classical Praguean conception of the relation between neutralization and assimilation into the autosegmental framework, and assume that assimilation is always feature-filling. All instances of the effect of feature-changing assimilation rules, then, are the result of two independent rules of (1) delinking and (2) spreading (Poser 1982, Mascaró 1987).

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