In this paper we discuss the acquisition of the voicing system of Malagasy, an Austronesian language. Our study is based on the longitudinal data of 3 children ages 19 to 32 months, and is to our knowledge the first systematic investigation of the acquisition of Malagasy. The Malagasy voicing system has a distinctive morphology and involves the promotion of an argument (actor, theme, instrument, etc.) to a referentially and syntactically prominent position, typically clause-final. We look at two competing accounts of the Malagasy voicing system, one in which the promoted argument is analyzed as a subject and the promotion operation an instance of A-movement (Guilfoyle, Hung & Travis 1992) and a more recent account in which Malagasy is analyzed as a V2-like language in which the promoted argument is a topic and the promotion an instance of A'-movement (Pearson 2001(Pearson , 2005. Both these analyses have clear implications for acquisition, which we examine in this paper. Our acquisition results favor the analysis of the promoted argument as an A'-element. We also show that there is a developmental stage in Malagasy that parallels the root infinitive (RI) stage widely observed in various European languages. Apparent differences between the Germanic RIs and the analogous phenomenon in Malagasy are derived from differences in the functional structure associated with a voicing system as opposed to an agreement system. Malagasy Acquisition.3

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We argue that Malagasy (and related W. Austronesian languages!) has a positive setting for a macro-parameter RICH VOICE MORPHOLOGY which builds complex predicates that code the theta role of their argument: S = [[PreN(6) + (X)] + DP]. Manifestations of this parameter are: (1) Case and theta role are assigned in situ in nuclear clauses with no movement or co-indexing to a topic position. (2) Relative Clauses (and other "extraction" structures) satisfy the "Subjects Only" constraint, again with no movement or indexing. (3) UTAH is freely violated, as theta role assignment derives from compositional semantic interpretation. Predicates resemble lexical Ns in assigning case directly to arguments without using Prepositions and in combining directly with Dets to form DPs that include tense and negation (Keenan 1995, 2000). The major Predicate-Argument type is modeled on the Noun+Possessor one, not the Verb+Object one.